CVE Feed

    Dashboard / CVE / CVE-2021-38496

    CVE-2021-38496

    During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

    Published:Oct 5, 2021
    Last Modified:Nov 21, 2024
    EPS:Nov 3, 2021
    EPSS Score:0.01243
    CVSS Score:8.8

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Firefox Esr
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-77118 (CVSS 8.4) — A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pc…
    CVE-2026-56968 (CVSS 3.7) — GNU SASL before 2.2.4 lacks sanitization of a short challenge in _gsasl_ntlm_client_step in the NTLM client, w…
    CVE-2026-49975 (CVSS 7.5) — Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of …
    CVE-2026-9256 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerabilit…
    CVE-2026-31431 (CVSS 7.8) — In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating …
    CVE-2026-34757 (CVSS 5.1) — LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network …
    CVE-2026-4775 (CVSS 7.8) — A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerabili…
    CVE-2025-63261 (CVSS 7.8) — AWStats 8.0 is vulnerable to Command Injection via the open function…
    CVE-2026-3497 (CVSS 6.9) — Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects …
    CVE-2026-1940 (CVSS 5.1) — An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function. The p…

    References

    https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
    https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
    https://www.debian.org/security/2022/dsa-5034
    https://www.mozilla.org/security/advisories/mfsa2021-43/
    https://www.mozilla.org/security/advisories/mfsa2021-44/
    https://www.mozilla.org/security/advisories/mfsa2021-45/
    https://www.mozilla.org/security/advisories/mfsa2021-46/
    https://www.mozilla.org/security/advisories/mfsa2021-47/
    https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
    https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
    https://www.debian.org/security/2022/dsa-5034
    https://www.mozilla.org/security/advisories/mfsa2021-43/
    https://www.mozilla.org/security/advisories/mfsa2021-44/
    https://www.mozilla.org/security/advisories/mfsa2021-45/
    https://www.mozilla.org/security/advisories/mfsa2021-46/
    https://www.mozilla.org/security/advisories/mfsa2021-47/

    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