Rapid7 Vulnerability & Exploit Database

Red Hat: CVE-2021-29946: CVE-2021-29946 Mozilla: Port blocking could be bypassed (Multiple Advisories)

Free InsightVM Trial No Credit Card Necessary
2024 Attack Intel Report Latest research by Rapid7 Labs
Back to Search

Red Hat: CVE-2021-29946: CVE-2021-29946 Mozilla: Port blocking could be bypassed (Multiple Advisories)

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
04/26/2021
Created
04/27/2021
Added
04/27/2021
Modified
12/15/2023

Description

Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

Solution(s)

  • redhat-upgrade-firefox
  • redhat-upgrade-firefox-debuginfo
  • redhat-upgrade-firefox-debugsource
  • redhat-upgrade-thunderbird
  • redhat-upgrade-thunderbird-debuginfo
  • redhat-upgrade-thunderbird-debugsource

References

  • CVE-2021-29946
  • RHSA-2021:1350
  • RHSA-2021:1351
  • RHSA-2021:1352
  • RHSA-2021:1353
  • RHSA-2021:1360
  • RHSA-2021:1361
  • RHSA-2021:1362
  • RHSA-2021:1363
View more

insightVM

Advanced vulnerability management analytics and reporting.
Key Features
Free InsightVM Trial View All Features

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;