Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability — CISCO-SA-PHONE-DOS-TXMYNRZV
Cisco · Cisco · CISCO-SA-PHONE-DOS-TXMYNRZV
ID
CISCO-SA-PHONE-DOS-TXMYNRZV
CISCO-SA-PHONE-DOS-TXMYNRZV
Date
Source
Cisco
Cisco
Vendor
Cisco
Cisco
Threat
high
high
Summary
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…
Timeline
- Published by source
- 2026-09-02
Risk context
- Reported severity or threat level: high.
- Review exposure for the affected product or family: Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service.
Product
Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service
What to do
General, cautious steps (verify details in the official source):
- Prioritize patching or mitigation immediately (treat as actively risky).
- Identify affected product versions in your inventory and verify whether you are impacted.
- Apply vendor patches/updates or recommended mitigations as soon as available.
- Read the official advisory for exact affected versions and remediation steps.
Official advisory
Evidence and provenance
- Canonical advisory ID
- CISCO-SA-PHONE-DOS-TXMYNRZV
- Source
- Cisco
- Vendor
- Cisco
- Published by source
- 2026-09-02
- Last source activity
- 2026-09-02
- Additional identifiers
- CVE-2026-20281
- Curated by
- hlukh.ch
Related advisories and connections
These advisories are connected by shared CVE, product, vendor, source, or time signals.