Cisco Session Initiation Protocol Software up to 14.3(1)SR1 Packet information disclosure

Summaryinfo

A vulnerability classified as problematic has been found in Cisco Session Initiation Protocol Software. This impacts an unknown function of the component Packet Handler. Performing a manipulation results in information disclosure. This vulnerability is cataloged as CVE-2025-20336. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Cisco Session Initiation Protocol Software. This affects some unknown processing of the component Packet Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at sec.cloudapps.cisco.com. This vulnerability is uniquely identified as CVE-2025-20336 since 10/10/2024. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/05/2026). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-1958). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Cisco IP Phone

Productinfo

Vendor

• Cisco

Name

• Session Initiation Protocol Software

Version

• 2.0(1)
• 2.1(1)
• 2.2(1)
• 2.3(1)
• 2.3(1)SR1
• 3.0(1)
• 3.1(1)
• 3.1(1)SR1
• 3.2(1)
• 9.3(3)
• 10.1(1)SR1
• 10.1(1)SR2
• 10.1(1.9)
• 10.2(1)
• 10.2(1)SR1
• 10.2(2)
• 10.3(1)
• 10.3(1)SR1
• 10.3(1)SR2
• 10.3(1)SR3
• 10.3(1)SR4
• 10.3(1)SR4b
• 10.3(1)SR5
• 10.3(1)SR6
• 10.3(1)SR7
• 10.3(2)
• 11-0-1MSR1-1
• 11.0(0.7) MPP
• 11.0(1)
• 11.5(1)
• 11.5(1)SR1
• 11.7(1)
• 12.0(1)
• 12.0(1)SR1
• 12.0(1)SR2
• 12.0(1)SR3
• 12.1(1)
• 12.1(1)SR1
• 12.5(1)
• 12.5(1)SR1
• 12.5(1)SR2
• 12.5(1)SR3
• 12.6(1)
• 12.6(1)SR1
• 12.7(1)
• 12.7(1)SR1
• 12.8(1)
• 12.8(1)SR1
• 12.8(1)SR2
• 14.0(1)
• 14.0(1)SR1
• 14.0(1)SR2
• 14.0(1)SR3
• 14.1(1)
• 14.1(1)SR1
• 14.1(1)SR2
• 14.1(1)SR3
• 14.2(1)
• 14.2(1)SR1
• 14.2(1)SR2
• 14.2(1)SR3
• 14.2(1)SR4
• 14.3(1)
• 14.3(1)SR1

License

• commercial

Website

• Vendor: https://www.cisco.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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