CVE-2026-20311

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

Score 6.3 from GitHub Security Advisory published 2026-08-05. A secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.3Exploit: None knownExposed services: Not assessed

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

A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA SSVC

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
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
15th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 6, 2026

Advisory Details (1)

Auto-updated Aug 5, 2026
No fix on record yet.
generic

Cisco IOS XE Software Web-Based Management Interface Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-PtAODAWW

Vendor Advisories for CVE-2026-20311(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 12× in last 7d / 63× 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 154 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-20311?
CVE-2026-20311 is a medium vulnerability published on August 5, 2026. A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error handling in the web-based management…
When was CVE-2026-20311 disclosed?
CVE-2026-20311 was first published on August 5, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20311 actively exploited?
CVE-2026-20311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-20311?
CVE-2026-20311 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-20311?
No fix for CVE-2026-20311 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-20311 are linked in the Vendor Advisories panel on this page.

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