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    CVE-2021-23978

    Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.

    Published:Feb 23, 2021
    Last Modified:Nov 21, 2024
    EPS:Feb 26, 2021
    EPSS Score:0.00754
    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

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    References

    https://bugzilla.mozilla.org/buglist.cgi?bug_id=786797%2C1682928%2C1687391%2C1687597
    https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
    https://security.gentoo.org/glsa/202104-09
    https://security.gentoo.org/glsa/202104-10
    https://www.debian.org/security/2021/dsa-4866
    https://www.mozilla.org/security/advisories/mfsa2021-07/
    https://www.mozilla.org/security/advisories/mfsa2021-08/
    https://www.mozilla.org/security/advisories/mfsa2021-09/
    https://bugzilla.mozilla.org/buglist.cgi?bug_id=786797%2C1682928%2C1687391%2C1687597
    https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
    https://security.gentoo.org/glsa/202104-09
    https://security.gentoo.org/glsa/202104-10
    https://www.debian.org/security/2021/dsa-4866
    https://www.mozilla.org/security/advisories/mfsa2021-07/
    https://www.mozilla.org/security/advisories/mfsa2021-08/
    https://www.mozilla.org/security/advisories/mfsa2021-09/

    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