CVE-2026-20263

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.

A vulnerability in the Blocks Extensible Exchange Protocol (BEEP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling when parsing a specific BEEP SOAP request. An attacker could exploit this vulnerability by sending a specific BEEP SOAP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.

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
26%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 6, 2026

Advisory Details (1)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

Cisco IOS XE Software Blocks Extensible Exchange Protocol Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-bing-MGHrFAkd

Vendor Advisories for CVE-2026-20263(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 28× in last 7d / 62× 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 12:22 UTCGHSA enrichment
  2. 2026-08-20 00:03 UTCEG score recompute
  3. 2026-08-20 00:03 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 11:44 UTCGHSA enrichment
  6. 2026-08-18 23:25 UTCEG score recompute
  7. 2026-08-18 23:24 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 11:05 UTCGHSA enrichment
  10. 2026-08-17 22:44 UTCEG score recompute
  11. 2026-08-17 22:44 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 10:25 UTCGHSA enrichment
  14. 2026-08-16 22:08 UTCEG score recompute
  15. 2026-08-16 22:08 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 09:49 UTCEG score recompute
  18. 2026-08-16 09:49 UTCGHSA enrichment
  19. 2026-08-16 02:14 UTCEPSS rescore
  20. 2026-08-15 21:32 UTCGHSA enrichment
  21. 2026-08-15 09:14 UTCEG score recompute
  22. 2026-08-15 09:14 UTCGHSA enrichment
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 20:55 UTCGHSA enrichment
  25. 2026-08-14 08:37 UTCEG score recompute
Show 37 more
  1. 2026-08-14 08:37 UTCGHSA enrichment
  2. 2026-08-13 22:00 UTCEPSS rescore
  3. 2026-08-13 20:19 UTCGHSA enrichment
  4. 2026-08-13 08:01 UTCGHSA enrichment
  5. 2026-08-12 19:43 UTCEG score recompute
  6. 2026-08-12 19:43 UTCGHSA enrichment
  7. 2026-08-12 13:50 UTCEPSS rescore
  8. 2026-08-12 07:25 UTCGHSA enrichment
  9. 2026-08-11 19:07 UTCEG score recompute
  10. 2026-08-11 19:07 UTCGHSA enrichment
  11. 2026-08-11 13:42 UTCEPSS rescore
  12. 2026-08-11 06:49 UTCEG score recompute
  13. 2026-08-11 06:49 UTCGHSA enrichment
  14. 2026-08-11 00:00 UTCEPSS rescore
  15. 2026-08-10 18:31 UTCGHSA enrichment
  16. 2026-08-10 06:12 UTCGHSA enrichment
  17. 2026-08-09 17:54 UTCEG score recompute
  18. 2026-08-09 17:54 UTCGHSA enrichment
  19. 2026-08-09 13:46 UTCEPSS rescore
  20. 2026-08-09 05:36 UTCGHSA enrichment
  21. 2026-08-08 17:18 UTCEG score recompute
  22. 2026-08-08 17:18 UTCGHSA enrichment
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 04:59 UTCGHSA enrichment
  25. 2026-08-07 16:41 UTCEG score recompute
  26. 2026-08-07 16:41 UTCGHSA enrichment
  27. 2026-08-07 04:23 UTCGHSA enrichment
  28. 2026-08-06 16:05 UTCEG score recompute
  29. 2026-08-06 16:05 UTCGHSA enrichment
  30. 2026-08-06 13:46 UTCEPSS rescore
  31. 2026-08-06 06:49 UTCGHSA enrichment
  32. 2026-08-05 18:31 UTCEG score recompute
  33. 2026-08-05 18:31 UTCGHSA enrichment
  34. 2026-08-05 17:57 UTCEG score recompute
  35. 2026-08-05 17:29 UTCEG score recompute
  36. 2026-08-05 16:52 UTCEG score recompute
  37. 2026-08-05 16:50 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-20263?
CVE-2026-20263 is a high vulnerability published on August 5, 2026. A vulnerability in the Blocks Extensible Exchange Protocol (BEEP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling when parsing a specific BEEP SOAP…
When was CVE-2026-20263 disclosed?
CVE-2026-20263 was first published in the National Vulnerability Database 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-2026-20263 actively exploited?
CVE-2026-20263 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 74.3% of all scored CVEs.
What is the CVSS score of CVE-2026-20263?
CVE-2026-20263 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-20263?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20263, 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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