CVE Feed

    Dashboard / CVE / CVE-2020-36242

    CVE-2020-36242

    In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.

    Published:Dec 9, 2020
    Last Modified:Nov 21, 2024
    EPS:Feb 7, 2021
    EPSS Score:0.01272
    CVSS Score:9.1

    Affected Products

    Vendor
    Cryptography.io
    Product
    Cryptography
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Network Function Cloud Native Environment
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Software Collections
    Vendor
    Redhat
    Product
    Rhev Hypervisor

    Exploits

    https://github.com/pyca/cryptography/issues/5615https://github.com/pyca/cryptography/issues/5615

    Related CVEs

    CVE-2026-39892 (CVSS 6.9) — cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 4…
    CVE-2026-34073 (CVSS 1.7) — cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior …
    CVE-2026-26007 (CVSS 8.2) — cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior …
    CVE-2024-26130 (CVSS 7.5) — cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Starti…
    CVE-2023-50782 (CVSS 7.5) — A flaw was found in the python-cryptography package. This issue may allow a remote attacker to decrypt capture…
    CVE-2023-49083 (CVSS 5.9) — cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Callin…
    CVE-2023-38325 (CVSS 7.5) — The cryptography package before 41.0.2 for Python mishandles SSH certificates that have critical options.…
    CVE-2023-23931 (CVSS 4.8) — cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In aff…
    CVE-2020-25659 (CVSS 5.9) — python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed pr…
    CVE-2016-9243 (CVSS 7.5) — HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.diges…

    References

    https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
    https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
    https://github.com/pyca/cryptography/issues/5615
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
    https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
    https://github.com/pyca/cryptography/issues/5615
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujul2022.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