CVE-2026-20279

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-02. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20279 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification
generic🔴 Active Exploitation

Cisco IOS XR Software Security Hardening Release: September 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxr-qg64NcM

Vendor Advisories for CVE-2026-20279(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 133× 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 133 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-20279?
CVE-2026-20279 is a critical vulnerability published on September 2, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The…
When was CVE-2026-20279 disclosed?
CVE-2026-20279 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20279 actively exploited?
CVE-2026-20279 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 77.0% of all scored CVEs.
What is the CVSS score of CVE-2026-20279?
CVE-2026-20279 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-20279?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20279, 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.

Dependency Blast Radius

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