CVE-2026-20281

HIGH

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 una...

Affects 0 products across 1 vendor.

CVSS 3.17.5
EPSS0.4%
Percentile28th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, no confidentiality impact, no integrity impact, full availability impact.
CWE Weakness Definitions
CWE-401: Memory Leak

Software does not release allocated memory after use, causing progressive consumption until failure.

◆ AI Analysis — automated analysis, not human-reviewed

A high severity vulnerability (CVE-2026-20281) affects the target system. 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 se...

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Frequently Asked Questions
What is CVE-2026-20281?
A high severity vulnerability (CVE-2026-20281) affects the target system. 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 se...
What is the CVSS score for CVE-2026-20281?
CVE-2026-20281 has CVSS 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS: 0.4%.
Is CVE-2026-20281 actively exploited?
No confirmed active exploitation of CVE-2026-20281 as of 2026-09-03.
How do I remediate CVE-2026-20281?
Apply vendor patches for CVE-2026-20281. Monitor Cisco advisories.
What systems are affected by CVE-2026-20281?
CVE-2026-20281 affects: Cisco.
Vulnerability Details
CVE IDCVE-2026-20281
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published2026-09-02
Last Modified2026-09-02
ICS Relevance55%
Weakness (CWE)
Memory Leak
SourceNVD
Official Description

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.

Source: NIST NVD / MITRE CVE Database

Affected Products
VendorProductFixed Version
Cisco — —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: September 2026 | Threat Age: 25 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
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