CVE-2026-20267

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreHIGH confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-05. a secondary CVSS source baseline 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.0Exploit: 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 XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20267 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284.

CVSS v3
9.0
EG Score
9.0(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity90% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Aug 5, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

Cisco IOS XE Software Security Hardening Release: August 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ

Vendor Advisories for CVE-2026-20267(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 57× in last 7d / 135× 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 135 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-20267?
CVE-2026-20267 is a critical vulnerability published on August 5, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The…
When was CVE-2026-20267 disclosed?
CVE-2026-20267 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20267 actively exploited?
CVE-2026-20267 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 84.0% of all scored CVEs.
What is the CVSS score of CVE-2026-20267?
CVE-2026-20267 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-20267?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20267, 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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