pjproject Telnet CLI Front-End cli_telnet.c handle_up_down stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k1.64

Summaryinfo

A vulnerability marked as problematic has been reported in pjproject. The impacted element is the function handle_up_down of the file cli_telnet.c of the component Telnet CLI Front-End. This manipulation causes stack-based overflow. The identification of this vulnerability is CVE-2026-57165. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in pjproject (the affected version is unknown) and classified as problematic. Affected by this vulnerability is the function handle_up_down of the file cli_telnet.c of the component Telnet CLI Front-End. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect availability. The summary by CVE is:

PJSIP is a free and open source multimedia communication library written in C. Prior to commit 628b716, a stack buffer overflow exists in the PJLIB-UTIL telnet CLI front-end when redrawing the command line during history recall (handle_up_down() in cli_telnet.c). This affects only applications that enable the telnet CLI front-end (same gating as the related CLI issue). The line-redraw sequence for a recalled history entry can accumulate more data than a fixed-size stack buffer holds, which may lead to application termination. Exploitation requires access to the unauthenticated telnet CLI, which already permits arbitrary CLI commands, so the additional impact is limited. Applications that do not enable the telnet CLI front-end are not affected. This issue has been patched via commit 628b716.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-57165 since 06/24/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Applying the patch 628b71638465bacf66e767959e6acbab822eccd6 is able to eliminate this problem.

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Productinfo

Type

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 628b71638465bacf66e767959e6acbab822eccd6

Timelineinfo

06/24/2026 CVE reserved
09/04/2026 +72 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-57165 (🔒)
GCVE (CVE): GCVE-0-2026-57165
GCVE (VulDB): GCVE-100-399109

Entryinfo

Created: 09/04/2026 19:42
Changes: 09/04/2026 19:42 (68)
Complete: 🔍
Cache ID: 216::103

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