CVE-2026-71217

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 2026-08-11. 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 — 4 sources updated this week

Also known asEUVD-2026-55990 (ENISA EUVD) · GHSA-4jvc-h3x3-w6qj (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines 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

A fix is available — apply it.

A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as parallel and len, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.

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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
50th
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 2026-10-27). 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.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).

A fix is available. Apply it within your standard update timelines 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.

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

August 11, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 11, 2026
Patch available. Sources: redhat.
Red Hat

2460984 – (CVE-2026-71217) CVE-2026-71217 iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion

https://bugzilla.redhat.com/show_bug.cgi?id=2460984
Red HatMentions a patch (unverified)

CVE-2026-71217 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-71217

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatiperf3-0:3.17.1-6.el10_2.12026-08-31redhat
redhatiperf3-0:3.5-12.el8_10.12026-08-31redhat
redhatiperf3-0:3.9-17.el9_8.12026-08-31redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
iperf33.12-1 ... 3.22-0.1 (17 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
iperf33.18-2 ... 3.22-0.1 (9 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
iperf33.18-2 ... 3.20-2.1 (6 versions)
  • every version up to 3.22-0.1: fixed in 3.22-0.1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 54× 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 318 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 218 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  2. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  4. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  7. 2026-10-28 12:07 UTCEG score recompute
  8. 2026-10-28 12:07 UTCVendor advisory
  9. 2026-10-28 12:07 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  10. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  11. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  12. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  13. 2026-10-25 14:08 UTCEG score recompute
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  16. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  18. 2026-10-20 18:36 UTCEG score recompute
  19. 2026-10-20 18:36 UTCVendor advisory
  20. 2026-10-20 18:36 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  22. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  23. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  24. 2026-10-18 03:17 UTCEG score recompute
  25. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 49th percentile
Show 75 more
  1. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  4. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  5. 2026-10-13 08:31 UTCEG score recompute
  6. 2026-10-13 08:31 UTCVendor advisory
  7. 2026-10-13 08:31 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  8. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  9. 2026-10-12 15:43 UTCEG score recompute
  10. 2026-10-11 19:28 UTCEG score recompute
  11. 2026-10-11 16:43 UTCEG score recompute
  12. 2026-10-11 14:04 UTCEG score recompute
  13. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  15. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  18. 2026-10-06 18:05 UTCEG score recompute
  19. 2026-10-06 18:05 UTCVendor advisory
  20. 2026-10-06 18:05 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  22. 2026-10-05 18:10 UTCEG score recompute
  23. 2026-10-05 18:10 UTCVendor advisory
  24. 2026-10-05 18:10 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  26. 2026-10-04 22:47 UTCVendor advisory
  27. 2026-10-04 22:47 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  28. 2026-10-04 10:12 UTCVendor advisory
  29. 2026-10-04 10:12 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-10-03 21:34 UTCEG score recompute
  31. 2026-10-03 21:34 UTCVendor advisory
  32. 2026-10-03 21:34 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  33. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  34. 2026-10-02 22:29 UTCEG score recompute
  35. 2026-10-02 22:29 UTCVendor advisory
  36. 2026-10-02 22:29 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  38. 2026-10-02 08:47 UTCEG score recompute
  39. 2026-10-02 08:47 UTCVendor advisory
  40. 2026-10-02 08:47 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  42. 2026-10-01 10:53 UTCVendor advisory
  43. 2026-10-01 10:53 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-09-30 22:22 UTCEG score recompute
  45. 2026-09-30 22:22 UTCVendor advisory
  46. 2026-09-30 22:22 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  48. 2026-09-29 05:18 UTCEG score recompute
  49. 2026-09-29 05:18 UTCVendor advisory
  50. 2026-09-29 05:18 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  51. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  52. 2026-09-28 02:21 UTCEG score recompute
  53. 2026-09-28 02:21 UTCVendor advisory
  54. 2026-09-28 02:21 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  56. 2026-09-27 11:03 UTCEG score recompute
  57. 2026-09-27 11:03 UTCVendor advisory
  58. 2026-09-27 11:03 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  60. 2026-09-25 03:57 UTCEG score recompute
  61. 2026-09-25 03:57 UTCVendor advisory
  62. 2026-09-25 03:57 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  63. 2026-09-24 02:03 UTCEG score recompute
  64. 2026-09-24 02:03 UTCVendor advisory
  65. 2026-09-24 02:03 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  66. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  67. 2026-09-23 13:38 UTCVendor advisory
  68. 2026-09-23 13:38 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  69. 2026-09-23 01:11 UTCEG score recompute
  70. 2026-09-23 01:11 UTCVendor advisory
  71. 2026-09-23 01:11 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-09-22 12:45 UTCVendor advisory
  73. 2026-09-22 12:45 UTCGHSA enrichmentGHSA-4jvc-h3x3-w6qj · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-09-22 00:20 UTCEG score recompute
  75. 2026-09-22 00:20 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-71217?
CVE-2026-71217 is a high-severity vulnerability; its CVE record was published on August 11, 2026. A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as parallel and len, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread…
When was CVE-2026-71217 made public?
CVE-2026-71217 was made public on August 11, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on August 11, 2026. EchelonGraph's copy of the record carries a last-modified date of August 31, 2026; the record at its source may have been updated since.
Is CVE-2026-71217 actively exploited?
CVE-2026-71217 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (50th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71217?
CVE-2026-71217 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-2026-71217?
A fix for CVE-2026-71217 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-71217 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-71217

Explore →

Is Your Infrastructure Affected by CVE-2026-71217?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.