CVE-2026-20271

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: 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-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.  

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
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-2026-20271(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 22× in last 7d / 98× 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 160 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-20271?
CVE-2026-20271 is a high 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-2026-20271 disclosed?
CVE-2026-20271 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-2026-20271 actively exploited?
CVE-2026-20271 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 79.6% of all scored CVEs.
What is the CVSS score of CVE-2026-20271?
CVE-2026-20271 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-20271?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20271, 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

Explore the affected products and dependency analysis for CVE-2026-20271

Explore →

Is Your Infrastructure Affected by CVE-2026-20271?

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

Start Free Scan →Browse All CVEs