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    CVE-2020-28361

    Kamailio before 5.4.0, as used in Sip Express Router (SER) in Sippy Softswitch 4.5 through 5.2 and other products, allows a bypass of a header-removal protection mechanism via whitespace characters. This occurs in the remove_hf function in the Kamailio textops module. Particular use of remove_hf in Sippy Softswitch may allow skilled attacker having a valid credential in the system to disrupt internal call start/duration accounting mechanisms leading potentially to a loss of revenue.

    Published:Nov 18, 2020
    Last Modified:Nov 21, 2024
    EPS:Nov 18, 2020
    EPSS Score:0.00135
    CVSS Score:5.4

    Affected Products

    Vendor
    Kamailio
    Product
    Kamailio

    Exploits

    https://packetstormsecurity.com/files/159030/Kamailio-5.4.0-Header-Smuggling.htmlhttps://packetstormsecurity.com/files/159030/Kamailio-5.4.0-Header-Smuggling.html

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

    CVE-2026-52023 (CVSS 7.5) — An issue in kamailio v.6.1.1 and before allows a remote attacker to cause a denial of service via the ims_regi…
    CVE-2026-52022 (CVSS 7.5) — An issue in kamailio v.6.1.1 and before allows a remote attacker to cause a denial of service via the IMS P-CS…
    CVE-2026-82608 (CVSS 2.1) — A vulnerability was determined in Kamailio up to 5.5.0/6.0.7. This affects the function get_4bytes of the file…
    CVE-2026-39864 (CVSS 4.4) — Kamailio is an open source implementation of a SIP Signaling Server. Prior to 6.0.5 and 5.8.7, an out-of-bound…
    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-2020-27507 (CVSS 9.8) — The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, lea…

    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