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    CVE-2022-21716

    Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 22.2.0, Twisted SSH client and server implement is able to accept an infinite amount of data for the peer's SSH version identifier. This ends up with a buffer using all the available memory. The attach is a simple as `nc -rv localhost 22 < /dev/zero`. A patch is available in version 22.2.0. There are currently no known workarounds.

    Published:Mar 3, 2022
    Last Modified:Apr 22, 2025
    EPS:Mar 3, 2022
    EPSS Score:0.00966
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Oracle
    Product
    Http Server
    Vendor
    Oracle
    Product
    Zfs Storage Appliance Kit
    Vendor
    Redhat
    Product
    Openstack
    Vendor
    Twisted
    Product
    Twisted

    Exploits

    https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgxhttps://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-100 Overflow Buffers
    CAPEC-125 Flooding
    CAPEC-130 Excessive Allocation
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-147 XML Ping of the Death
    CAPEC-197 Exponential Data Expansion
    CAPEC-229 Serialized Data Parameter Blowup
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-42 MIME Conversion
    CAPEC-44 Overflow Binary Resource File
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-469 HTTP DoS
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-482 TCP Flood
    CAPEC-486 UDP Flood
    CAPEC-487 ICMP Flood
    CAPEC-488 HTTP Flood
    CAPEC-489 SSL Flood
    CAPEC-490 Amplification
    CAPEC-491 Quadratic Data Expansion
    CAPEC-493 SOAP Array Blowup
    CAPEC-494 TCP Fragmentation
    CAPEC-495 UDP Fragmentation
    CAPEC-496 ICMP Fragmentation
    CAPEC-528 XML Flood
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities
    CAPEC-92 Forced Integer Overflow

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    References

    https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9
    https://github.com/twisted/twisted/releases/tag/twisted-22.2.0
    https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx
    https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
    https://security.gentoo.org/glsa/202301-02
    https://twistedmatrix.com/trac/ticket/10284
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://github.com/twisted/twisted/commit/89c395ee794e85a9657b112c4351417850330ef9
    https://github.com/twisted/twisted/releases/tag/twisted-22.2.0
    https://github.com/twisted/twisted/security/advisories/GHSA-rv6r-3f5q-9rgx
    https://lists.debian.org/debian-lts-announce/2022/03/msg00009.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7U6KYDTOLPICAVSR34G2WRYLFBD2YW5K/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLKHA6WREIVAMBQD7KKWYHPHGGNKMAG6/
    https://security.gentoo.org/glsa/202301-02
    https://twistedmatrix.com/trac/ticket/10284
    https://www.oracle.com/security-alerts/cpuapr2022.html

    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