CVE-2026-57166: medium-severity vulnerability in pjsip pjproject
PJSIP: Pre-authentication overflow in the telnet CLI error
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.3epss 0.5%
PJSIP is a free and open source multimedia communication library written in C. Prior to commit 4472a31, a stack buffer overflow exists in the PJLIB-UTIL telnet CLI front-end when rendering feedback for an entered command line. Several command-line handling paths write an attacker-influenced amount of data into fixed-size buffers without sufficient bounds checking, so a long command line can overflow them. This affects only applications that enable the telnet CLI front-end (e.g. pj_cli_telnet_create() / --cli-telnet-port). The telnet CLI is an interactive administration interface with no authentication, so any client able to reach it can already issue arbitrary CLI commands. A malformed or overly long command line can overflow a fixed-size stack buffer while rendering command-line feedback, which may lead to application termination. Because reaching this code already requires access to the unauthenticated CLI, the impact beyond that existing access is limited. Applications that do not enable the telnet CLI front-end are not affected. This issue has been patched via commit 4472a31.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Affected products
pjsip · pjprojectRelated CVEs — pjsip pjproject
In the same product, most dangerous first.
CVE-2021-37706HIGHPotential integer underflow upon receiving STUN message in PJSIPEPSS 4.9%CVE-2022-21723CRITICALOut-of-bounds read in multipart parsing in PJSIPEPSS 4.4%CVE-2022-23608HIGHUse after free in PJSIPEPSS 4.0%CVE-2021-43845HIGHPrevent out-of-bounds read in PJSIPEPSS 3.9%CVE-2022-24764HIGHStack buffer overflow in pjprojectEPSS 2.4%CVE-2022-21722CRITICALPotential out-of-bound read during RTP/RTCP parsing in PJSIPEPSS 2.3%