CVE-2026-20273

HIGHPre-NVD 8.68.6—
EchelonGraph scoreHIGH 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 a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

CVSS v3
8.6
EG Score
8.6(high)
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
19%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 17, 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-2026-20273(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 29× in last 7d / 67× 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.

  1. 2026-08-20 23:56 UTCEG score recompute
  2. 2026-08-20 23:56 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 12:07 UTCGHSA enrichment
  5. 2026-08-20 00:18 UTCEG score recompute
  6. 2026-08-20 00:18 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 12:29 UTCGHSA enrichment
  9. 2026-08-19 00:38 UTCEG score recompute
  10. 2026-08-19 00:38 UTCGHSA enrichment
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-18 12:49 UTCGHSA enrichment
  13. 2026-08-18 00:58 UTCEG score recompute
  14. 2026-08-18 00:58 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 13:05 UTCGHSA enrichment
  17. 2026-08-17 08:26 UTCGHSA enrichment
  18. 2026-08-16 20:37 UTCEG score recompute
  19. 2026-08-16 20:37 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 08:48 UTCEG score recompute
  22. 2026-08-16 08:48 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 20:59 UTCGHSA enrichment
  25. 2026-08-15 09:10 UTCEG score recompute
Show 42 more
  1. 2026-08-15 09:10 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 21:20 UTCGHSA enrichment
  4. 2026-08-14 13:10 UTCGHSA enrichment
  5. 2026-08-14 01:21 UTCEG score recompute
  6. 2026-08-14 01:21 UTCGHSA enrichment
  7. 2026-08-13 22:00 UTCEPSS rescore
  8. 2026-08-13 13:32 UTCGHSA enrichment
  9. 2026-08-13 01:43 UTCGHSA enrichment
  10. 2026-08-12 13:54 UTCEG score recompute
  11. 2026-08-12 13:54 UTCGHSA enrichment
  12. 2026-08-12 13:50 UTCEPSS rescore
  13. 2026-08-12 02:05 UTCGHSA enrichment
  14. 2026-08-11 14:16 UTCEG score recompute
  15. 2026-08-11 14:16 UTCGHSA enrichment
  16. 2026-08-11 13:42 UTCEPSS rescore
  17. 2026-08-11 02:27 UTCEG score recompute
  18. 2026-08-11 02:27 UTCGHSA enrichment
  19. 2026-08-11 00:00 UTCEPSS rescore
  20. 2026-08-10 14:38 UTCGHSA enrichment
  21. 2026-08-10 02:49 UTCGHSA enrichment
  22. 2026-08-09 15:00 UTCEG score recompute
  23. 2026-08-09 15:00 UTCGHSA enrichment
  24. 2026-08-09 13:46 UTCEPSS rescore
  25. 2026-08-09 03:11 UTCEG score recompute
  26. 2026-08-09 03:11 UTCGHSA enrichment
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-08 15:22 UTCGHSA enrichment
  29. 2026-08-08 03:32 UTCEG score recompute
  30. 2026-08-08 03:32 UTCGHSA enrichment
  31. 2026-08-07 15:43 UTCGHSA enrichment
  32. 2026-08-07 03:54 UTCGHSA enrichment
  33. 2026-08-06 16:05 UTCEG score recompute
  34. 2026-08-06 16:05 UTCGHSA enrichment
  35. 2026-08-06 13:46 UTCEPSS rescore
  36. 2026-08-06 06:20 UTCGHSA enrichment
  37. 2026-08-05 18:31 UTCEG score recompute
  38. 2026-08-05 18:31 UTCGHSA enrichment
  39. 2026-08-05 17:57 UTCEG score recompute
  40. 2026-08-05 17:29 UTCEG score recompute
  41. 2026-08-05 16:52 UTCEG score recompute
  42. 2026-08-05 16:50 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20273?
CVE-2026-20273 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 a software hardening release that addresses multiple internally discovered vulnerabilities. The…
When was CVE-2026-20273 disclosed?
CVE-2026-20273 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20273 actively exploited?
CVE-2026-20273 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 81.0% of all scored CVEs.
What is the CVSS score of CVE-2026-20273?
CVE-2026-20273 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-20273?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20273, 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-2026-20273

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