6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
0.003 Low
EPSS
Percentile
66.2%
A use-after-free could have occured when an HTTP2 session object was
released on a different thread, leading to memory corruption and a
potentially exploitable crash. This vulnerability affects Firefox < 93,
Thunderbird < 91.3, and Firefox ESR < 91.3.
Author | Note |
---|---|
tyhicks | mozjs contains a copy of the SpiderMonkey JavaScript engine |
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | thunderbird | < 1:91.5.0+build1-0ubuntu0.18.04.1 | UNKNOWN |
ubuntu | 20.04 | noarch | thunderbird | < 1:91.5.0+build1-0ubuntu0.20.04.1 | UNKNOWN |
bugzilla.mozilla.org/show_bug.cgi?id=1667102
launchpad.net/bugs/cve/CVE-2021-43535
nvd.nist.gov/vuln/detail/CVE-2021-43535
security-tracker.debian.org/tracker/CVE-2021-43535
ubuntu.com/security/notices/USN-5248-1
www.cve.org/CVERecord?id=CVE-2021-43535
www.mozilla.org/security/advisories/mfsa2021-43/
www.mozilla.org/security/advisories/mfsa2021-49/
www.mozilla.org/security/advisories/mfsa2021-50/
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
0.003 Low
EPSS
Percentile
66.2%