[NEW] [medium] Cisco IP Phone: Vulnerability enables Denial of Service
A remote, anonymous attacker can exploit a vulnerability in Cisco IP Phone to conduct a Denial of Service attack.
CSIRTS triage
- What
- A remote vulnerability in Cisco IP Phone allows unauthenticated attackers to conduct denial of service attacks.
- Who is affected
- Deployments of Cisco IP Phone systems accessible over the network.
- Urgency
- Medium severity; no active exploitation reported, but DoS attacks can disrupt communications infrastructure.
- Action
- Apply vendor security patches when available; restrict network access to IP phones if feasible.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3154
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20281 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highCVE-2026-20281: A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisc…nvd
- criticalCisco Advance Notification for Publication of September 2, 2026, Security Advisoriescisco-psirt
- highCisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of …cisco-psirt
Recent advisories for Cisco IP Phone
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-20281: A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisc…nvd · 2026-09-02
- highCisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of …cisco-psirt · 2026-09-02
- criticalexploitedCVE-2020-3161: Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerabilitycisa-kev · 2021-11-03
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