Information disclosure in Cisco Session Initiation Protocol (Sip) Software
CVE-2025-20336
A vulnerability in the directory permissions of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 could allow an unauthenticated, remote attacker to access sensitive information on an affected device. This vulnerability exists because the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. An attacker could exploit this vulnerability by sending a crafted packet to the IP address of a device that has Web Access enabled. A successful exploit could allow the attacker to access sensitive information from the device. Note: To exploit this vulnerability, Web Access must be enabled on the phone. Web Access is disabled by default.
Vulnerability class: Information Disclosure
EPSS: 0.004 (31.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Cisco Session Initiation Protocol (Sip) Software — versions 12.1(1)SR1, 11.5(1), 10.3(2)
- Cisco Desk_phone_9841
- Cisco Desk_phone_9841_firmware
- Cisco Desk_phone_9851
- Cisco Desk_phone_9851_firmware
- Cisco Desk_phone_9861
- Cisco Desk_phone_9861_firmware
- Cisco Desk_phone_9871
- Cisco Desk_phone_9871_firmware
- Cisco Ip_phone_7811
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-20336?
- CVE-2025-20336 is a medium-severity vulnerability in Cisco Session Initiation Protocol (Sip) Software, classified under Information Disclosure. CVSS score: 5.3/10. Published 2025-09-03.
- How severe is CVE-2025-20336?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-20336 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.