Vulnerability Details : CVE-2021-23969
As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If that’s not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage." Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was fixed to be the redirect destination's origin. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
Products affected by CVE-2021-23969
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-23969
0.32%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 70 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-23969
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
|
4.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
2.8
|
1.4
|
NIST |
References for CVE-2021-23969
-
https://www.mozilla.org/security/advisories/mfsa2021-08/
Security Vulnerabilities fixed in Firefox ESR 78.8 — MozillaRelease Notes;Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-09/
Security Vulnerabilities fixed in Thunderbird 78.8 — MozillaRelease Notes;Vendor Advisory
-
https://security.gentoo.org/glsa/202104-10
Mozilla Firefox: Multiple vulnerabilities (GLSA 202104-10) — Gentoo securityThird Party Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-07/
Security Vulnerabilities fixed in Firefox 86 — MozillaRelease Notes;Vendor Advisory
-
https://security.gentoo.org/glsa/202104-09
Mozilla Thunderbird: Multiple vulnerabilities (GLSA 202104-09) — Gentoo securityThird Party Advisory
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1542194
Access DeniedIssue Tracking;Permissions Required;Vendor Advisory
-
https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
[SECURITY] [DLA 2578-1] thunderbird security updateMailing List;Third Party Advisory
-
https://www.debian.org/security/2021/dsa-4866
Debian -- Security Information -- DSA-4866-1 thunderbirdThird Party Advisory
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