CVE-2021-42697

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    CVE-2021-42697

    Published: 2 Nov 2021Last Modified: 9 Jul 2026

    Summary:

    Details: Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a User-Agent header with deeply nested comments.

    References: https://akka.io/blog/, https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released, https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released, https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html, http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 3bd4b8a9566a8de9ecd730b50552b580ba3fe4c2
    Fixed -5243345ff8eeb2ad7663bbb2a1d6e217a725afda

    Affected versions

    v10.2.6
    v10.2.5
    v10.2.5-M2
    v10.2.5-M1
    v10.2.4
    v10.2.3
    v10.2.2
    v10.2.1
    v10.2.0

    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
    CVE-2021-42697 | CVE-DB