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    CVE-2021-26937

    encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.

    Published:Feb 9, 2021
    Last Modified:May 9, 2025
    EPS:Feb 9, 2021
    EPSS Score:0.02927
    CVSS Score:9.8

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Gnu
    Product
    Screen
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    http://www.openwall.com/lists/oss-security/2021/02/09/8https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.htmlhttps://www.openwall.com/lists/oss-security/2021/02/09/3http://www.openwall.com/lists/oss-security/2021/02/09/8https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.htmlhttps://www.openwall.com/lists/oss-security/2021/02/09/3

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    References

    http://www.openwall.com/lists/oss-security/2021/02/09/8
    https://ftp.gnu.org/gnu/screen/
    https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/
    https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
    https://security.gentoo.org/glsa/202105-11
    https://www.debian.org/security/2021/dsa-4861
    https://www.openwall.com/lists/oss-security/2021/02/09/3
    http://www.openwall.com/lists/oss-security/2021/02/09/8
    https://ftp.gnu.org/gnu/screen/
    https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/
    https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
    https://security.gentoo.org/glsa/202105-11
    https://security.netapp.com/advisory/ntap-20250509-0004/
    https://www.debian.org/security/2021/dsa-4861
    https://www.openwall.com/lists/oss-security/2021/02/09/3

    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