CVE-2021-23840

    Dashboard / Vulnerabilities / CVE-2021-23840

    CVE-2021-23840

    Published: 16 Feb 2021Last Modified: 8 Jul 2026

    Summary:

    Details: Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

    References: https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1, https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2, https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E, https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E, https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf, https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846, https://kc.mcafee.com/corporate/index?page=content&id=SB10366, https://security.gentoo.org/glsa/202103-03, https://security.netapp.com/advisory/ntap-20210219-0009/, https://security.netapp.com/advisory/ntap-20240621-0006/, https://www.debian.org/security/2021/dsa-4855, https://www.openssl.org/news/secadv/20210216.txt, https://www.tenable.com/security/tns-2021-03, https://www.tenable.com/security/tns-2021-09, https://www.tenable.com/security/tns-2021-10, https://www.oracle.com//security-alerts/cpujul2021.html, https://www.oracle.com/security-alerts/cpuApr2021.html, https://www.oracle.com/security-alerts/cpuapr2022.html, https://www.oracle.com/security-alerts/cpujan2022.html, https://www.oracle.com/security-alerts/cpuoct2021.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 251e15bf41dcc0c1b4e3debdb7d01f7082734ddd
    Fixed -None

    Affected versions

    19.3.5

    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-2021-23840 | CVE-DB