USN-5200-1

    Dashboard / Vulnerabilities / USN-5200-1

    USN-5200-1

    Published: 17 Dec 2021Last Modified: 22 Apr 2026

    Summary: python3.7, python3.8 vulnerabilities

    Details: It was discovered that the urllib.request.AbstractBasicAuthHandler class in Python contains regex allowing for catastrophic backtracking. Specially crafted traffic from a malicious HTTP server could cause a regular expression denial of service (ReDoS) condition for a client. (CVE-2020-8492) It was discovered that the urllib.request.AbstractBasicAuthHandler class in Python contains regex with a quadratic worst-case time complexity. Specially crafted traffic from a malicious HTTP server could cause a regular expression denial of service (ReDoS) condition for a client. (CVE-2021-3733) It was discovered that the Python urllib http client could enter into an infinite loop when incorrectly handling certain server responses (100 Continue response). Specially crafted traffic from a malicious HTTP server could cause a denial of service (DoS) condition for a client. (CVE-2021-3737)

    References: https://ubuntu.com/security/notices/USN-5200-1, https://ubuntu.com/security/CVE-2020-8492, https://ubuntu.com/security/CVE-2021-3733, https://ubuntu.com/security/CVE-2021-3737

    Affected packages

    Package

    Name: python3.7

    Purl: pkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.7.5-2ubuntu1~18.04.2

    Affected versions

    3.7.0~a2-1
    3.7.0~a3-1
    3.7.0~a3-2
    3.7.0~a3-3
    3.7.0~a4-1
    3.7.0~b1-1
    3.7.0~b1-1build1
    3.7.0~b2-1
    3.7.0~b3-1
    3.7.0-1~18.04
    3.7.1-1~18.04
    3.7.3-2~18.04.1
    3.7.5-2~18.04
    3.7.5-2~18.04.4

    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
    USN-5200-1 | CVE-DB