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    CVE-2017-2921

    An exploitable memory corruption vulnerability exists in the Websocket protocol implementation of Cesanta Mongoose 6.8. A specially crafted websocket packet can cause an integer overflow, leading to a heap buffer overflow and resulting in denial of service and potential remote code execution. An attacker needs to send a specially crafted websocket packet over network to trigger this vulnerability.

    Published:Nov 7, 2017
    Last Modified:Apr 20, 2025
    EPS:Nov 7, 2017
    EPSS Score:0.02149
    CVSS Score:9.8

    Affected Products

    Vendor
    Cesanta
    Product
    Mongoose

    Exploits

    https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0428https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0428

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-73253 (CVSS 9.1) — Mongoose is an embedded web server and network library. Prior to version 7.22, an on-path network attacker wit…
    CVE-2026-73255 (CVSS 6.5) — Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can control an SSI-enab…
    CVE-2026-73259 (CVSS 5.4) — Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can send a crafted pe…
    CVE-2026-73256 (CVSS 9.1) — Mongoose is an embedded web server and network library. Prior to 7.22, a remote unauthenticated attacker can e…
    CVE-2026-73254 (CVSS 5.4) — Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can create a file with …
    CVE-2026-73258 (CVSS 6.5) — Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can place a lone carr…
    CVE-2026-73251 (CVSS 9.3) — Mongoose is an embedded web server and network library. Prior to 7.23, a network attacker can impersonate a TL…
    CVE-2026-73257 (CVSS 9.1) — Mongoose is an embedded web server and network library. Priro to version 7.22, a remote unauthenticated attack…
    CVE-2026-11404 (CVSS 8.7) — Cesanta Mongoose before 7.22 contains an out-of-bounds read in the built-in TLS server function mg_tls_server_…
    CVE-2026-6986 (CVSS 2.9) — A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mg_…

    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