CVE-2026-20281

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-70209 (ENISA EUVD) · GHSA-998p-wvfv-584p (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition. Note: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 2, 2026

Last Modified

September 2, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
No fix on record yet.
Web page

Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-txMYNRzv

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 59× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 173 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 73 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-11-01 15:10 UTCEG score recompute
  3. 2026-11-01 15:09 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  7. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  11. 2026-10-25 14:44 UTCEG score recompute
  12. 2026-10-25 04:23 UTCEG score recompute
  13. 2026-10-25 04:23 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  15. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  16. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  17. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  18. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  19. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  20. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-10-18 03:57 UTCEG score recompute
  22. 2026-10-17 17:36 UTCEG score recompute
  23. 2026-10-17 17:36 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  25. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 28th percentile
Show 75 more
  1. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-10-12 16:24 UTCEG score recompute
  6. 2026-10-11 20:05 UTCEG score recompute
  7. 2026-10-11 17:18 UTCEG score recompute
  8. 2026-10-11 14:51 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  10. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-10-10 12:30 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  12. 2026-10-09 23:47 UTCEG score recompute
  13. 2026-10-09 23:46 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-09 01:39 UTCEG score recompute
  16. 2026-10-09 01:39 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  17. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-10-07 23:41 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-10-07 07:54 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-10-06 19:09 UTCEG score recompute
  22. 2026-10-06 19:09 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  23. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-10-06 06:25 UTCEG score recompute
  25. 2026-10-06 06:25 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  26. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  27. 2026-10-05 16:42 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  28. 2026-10-05 03:25 UTCEG score recompute
  29. 2026-10-05 03:25 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  31. 2026-10-04 14:29 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  32. 2026-10-04 01:46 UTCEG score recompute
  33. 2026-10-04 01:46 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  34. 2026-10-03 12:52 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  35. 2026-10-02 22:11 UTCEG score recompute
  36. 2026-10-02 22:11 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-10-02 09:28 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  38. 2026-10-01 20:46 UTCEG score recompute
  39. 2026-10-01 20:46 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  40. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  41. 2026-10-01 08:03 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-09-30 19:20 UTCEG score recompute
  43. 2026-09-30 19:20 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  45. 2026-09-30 03:03 UTCEG score recompute
  46. 2026-09-30 03:03 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  48. 2026-09-29 09:46 UTCEG score recompute
  49. 2026-09-29 09:46 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-09-28 20:54 UTCEG score recompute
  51. 2026-09-28 20:54 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  53. 2026-09-28 08:11 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  54. 2026-09-27 19:28 UTCEG score recompute
  55. 2026-09-27 19:28 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  57. 2026-09-27 06:46 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-09-26 18:03 UTCEG score recompute
  59. 2026-09-26 18:03 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  60. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  61. 2026-09-26 04:52 UTCEG score recompute
  62. 2026-09-26 04:52 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  63. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  64. 2026-09-25 11:16 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  65. 2026-09-24 21:59 UTCEG score recompute
  66. 2026-09-24 21:59 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  68. 2026-09-24 08:47 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  69. 2026-09-23 20:04 UTCEG score recompute
  70. 2026-09-23 20:04 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  71. 2026-09-23 07:21 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-09-22 18:39 UTCEG score recompute
  73. 2026-09-22 18:39 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-09-22 05:54 UTCEG score recompute
  75. 2026-09-22 05:54 UTCGHSA enrichmentGHSA-998p-wvfv-584p · GitHub severity HIGH · GitHub CVSS 7.5

Frequently asked(5)

What is CVE-2026-20281?
CVE-2026-20281 is a high-severity vulnerability; its CVE record was published on September 2, 2026. A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This…
When was the CVE record for CVE-2026-20281 published?
The CVE record for CVE-2026-20281 was published on September 2, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 2, 2026; the record at its source may have been updated since.
Is CVE-2026-20281 actively exploited?
CVE-2026-20281 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-20281?
CVE-2026-20281 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-20281?
No fix for CVE-2026-20281 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-20281 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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