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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (32.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
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
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.