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    CVE-2020-27507

    The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.

    Published:Mar 15, 2023
    Last Modified:Feb 27, 2025
    EPS:Mar 15, 2023
    EPSS Score:0.00079
    CVSS Score:9.8

    Affected Products

    Vendor
    Kamailio
    Product
    Kamailio

    Exploits

    https://github.com/kamailio/kamailio/issues/2503https://github.com/kamailio/kamailio/issues/2503

    Related CVEs

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    CVE-2026-39863 (CVSS 7.5) — Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.1.1, 6.0.6, and 5.8.8, an out-…
    CVE-2025-12207 (CVSS 1.9) — A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.…
    CVE-2025-12206 (CVSS 1.9) — A flaw has been found in Kamailio 5.5. The impacted element is the function rve_is_constant of the file src/co…
    CVE-2025-12205 (CVSS 1.9) — A vulnerability was detected in Kamailio 5.5. The affected element is the function sr_push_yy_state of the fil…
    CVE-2025-12204 (CVSS 1.9) — A security vulnerability has been detected in Kamailio 5.5. Impacted is the function rve_destroy of the file s…
    CVE-2020-28361 (CVSS 5.4) — Kamailio before 5.4.0, as used in Sip Express Router (SER) in Sippy Softswitch 4.5 through 5.2 and other produ…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High