CVE-2026-20281

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) 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 memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition. Note: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 2, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-txMYNRzv

Vendor Advisories for CVE-2026-20281(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 26× in last 7d / 38× 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. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 14:51 UTCEG score recompute
  3. 2026-09-11 14:51 UTCGHSA enrichment
  4. 2026-09-11 09:36 UTCEPSS rescore
  5. 2026-09-11 02:06 UTCGHSA enrichment
  6. 2026-09-10 13:23 UTCEG score recompute
  7. 2026-09-10 13:23 UTCGHSA enrichment
  8. 2026-09-10 09:34 UTCEPSS rescore
  9. 2026-09-10 00:37 UTCGHSA enrichment
  10. 2026-09-09 11:54 UTCGHSA enrichment
  11. 2026-09-08 23:11 UTCEG score recompute
  12. 2026-09-08 23:11 UTCGHSA enrichment
  13. 2026-09-08 22:00 UTCEPSS rescore
  14. 2026-09-08 03:53 UTCEG score recompute
  15. 2026-09-08 03:53 UTCGHSA enrichment
  16. 2026-09-07 16:01 UTCEPSS rescore
  17. 2026-09-07 15:09 UTCGHSA enrichment
  18. 2026-09-07 02:26 UTCEG score recompute
  19. 2026-09-07 02:26 UTCGHSA enrichment
  20. 2026-09-06 13:47 UTCEPSS rescore
  21. 2026-09-06 13:41 UTCGHSA enrichment
  22. 2026-09-06 00:58 UTCEG score recompute
  23. 2026-09-06 00:58 UTCGHSA enrichment
  24. 2026-09-05 12:13 UTCGHSA enrichment
  25. 2026-09-04 23:26 UTCEG score recompute
Show 13 more
  1. 2026-09-04 23:26 UTCGHSA enrichment
  2. 2026-09-04 09:45 UTCEG score recompute
  3. 2026-09-04 09:45 UTCGHSA enrichment
  4. 2026-09-04 05:06 UTCEPSS rescore
  5. 2026-09-03 21:01 UTCGHSA enrichment
  6. 2026-09-03 08:15 UTCGHSA enrichment
  7. 2026-09-02 19:31 UTCGHSA enrichment
  8. 2026-09-02 18:36 UTCEG score recompute
  9. 2026-09-02 18:36 UTCGHSA enrichment
  10. 2026-09-02 18:05 UTCEG score recompute
  11. 2026-09-02 17:35 UTCEG score recompute
  12. 2026-09-02 16:33 UTCEG score recompute
  13. 2026-09-02 16:31 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20281?
CVE-2026-20281 is a high vulnerability published on September 2, 2026. A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This…
When was CVE-2026-20281 disclosed?
CVE-2026-20281 was first published in the National Vulnerability Database on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20281 actively exploited?
CVE-2026-20281 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 73.9% of all scored CVEs.
What is the CVSS score of CVE-2026-20281?
CVE-2026-20281 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-20281?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20281, 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-2026-20281

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