CVE-2024-20454

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2024-08-07. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS: 9.8Exploit: NoneExposed: 0

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

Multiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business SPA500 Series IP Phones could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system with root privileges. These vulnerabilities exist because incoming HTTP packets are not properly checked for errors, which could result in a buffer overflow. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to overflow an internal buffer and execute arbitrary commands at the root privilege level.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
62(Track)
EG Risk 62/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation7% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
93%
KEV
Not listed

Published

August 7, 2024

Last Modified

August 23, 2024

Advisory Details (1)

Auto-updated May 30, 2026
No patch confirmed yet.
generic

Cisco Small Business SPA300 Series and SPA500 Series IP Phones Web UI Vulnerabilities

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-spa-http-vulns-RJZmX2Xz

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 103 total refreshes for this CVE.

  1. 2026-07-25 14:16 UTCEPSS rescore
  2. 2026-07-24 14:16 UTCEPSS rescore
  3. 2026-07-23 14:17 UTCEPSS rescore
  4. 2026-07-23 14:17 UTCEPSS rescore
  5. 2026-07-23 02:33 UTCEG score recompute
  6. 2026-07-22 23:19 UTCEG score recompute
  7. 2026-07-22 14:07 UTCEPSS rescore
  8. 2026-07-21 15:23 UTCEPSS rescore
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  1. 2026-07-09 19:09 UTCEPSS rescore
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  3. 2026-07-08 15:13 UTCEPSS rescore
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  11. 2026-06-30 23:21 UTCEPSS rescore
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  20. 2026-06-25 13:48 UTCEPSS rescore
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  22. 2026-06-24 14:04 UTCEPSS rescore
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  24. 2026-06-23 21:32 UTCEPSS rescore
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  26. 2026-06-22 14:24 UTCEPSS rescore
  27. 2026-06-22 14:24 UTCEPSS rescore
  28. 2026-06-21 14:55 UTCEPSS rescore
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  30. 2026-06-21 01:58 UTCEPSS rescore
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  32. 2026-06-18 17:51 UTCEPSS rescore
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  39. 2026-06-14 23:16 UTCEPSS rescore
  40. 2026-06-13 22:59 UTCEPSS rescore
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  42. 2026-06-12 23:11 UTCEPSS rescore
  43. 2026-06-11 13:59 UTCEPSS rescore
  44. 2026-06-11 13:59 UTCEPSS rescore
  45. 2026-06-10 22:17 UTCEPSS rescore
  46. 2026-06-10 13:21 UTCEPSS rescore
  47. 2026-06-10 13:21 UTCEPSS rescore
  48. 2026-06-08 14:16 UTCEPSS rescore
  49. 2026-06-08 14:16 UTCEPSS rescore
  50. 2026-06-06 13:46 UTCEPSS rescore
  51. 2026-06-06 13:46 UTCEPSS rescore
  52. 2026-06-05 22:46 UTCEPSS rescore
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  54. 2026-06-05 06:09 UTCEPSS rescore
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  56. 2026-06-04 13:11 UTCEPSS rescore
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  59. 2026-06-02 20:12 UTCEPSS rescore
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  61. 2026-06-01 13:51 UTCEPSS rescore
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  63. 2026-05-31 22:30 UTCEPSS rescore
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  67. 2026-05-29 13:43 UTCEPSS rescore
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  70. 2026-05-28 13:44 UTCEPSS rescore
  71. 2026-05-27 13:40 UTCEPSS rescore
  72. 2026-05-26 13:43 UTCEPSS rescore
  73. 2026-05-26 13:43 UTCEPSS rescore
  74. 2026-05-26 07:18 UTCEPSS rescore
  75. 2026-05-26 07:18 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2024-20454?
CVE-2024-20454 is a critical vulnerability published on August 7, 2024. Multiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business SPA500 Series IP Phones could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system with root privileges.…
When was CVE-2024-20454 disclosed?
CVE-2024-20454 was first published in the National Vulnerability Database on August 7, 2024, with the most recent update on August 23, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-20454 actively exploited?
CVE-2024-20454 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.9% of all scored CVEs.
What is the CVSS score of CVE-2024-20454?
CVE-2024-20454 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2024-20454?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-20454, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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