CVE-2021-29946: Integer Overflow
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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debian/firefoxto a version that resolves this vulnerability.Fixed in 118.0.2-1 - Upgrade
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debian/firefox-esrto a version that resolves this vulnerability.Fixed in 91.12.0esr-1~deb10u1Fixed in 115.3.1esr-1~deb10u1Fixed in 102.15.0esr-1~deb11u1Fixed in 115.3.1esr-1~deb11u1Fixed in 102.15.1esr-1~deb12u1Fixed in 115.3.0esr-1~deb12u1Fixed in 115.3.0esr-1 - Upgrade
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debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:91.12.0-1~deb10u1Fixed in 1:115.3.1-1~deb10u1Fixed in 1:102.13.1-1~deb11u1Fixed in 1:115.3.1-1~deb11u1Fixed in 1:102.15.1-1~deb12u1Fixed in 1:115.3.1-1~deb12u1Fixed in 1:115.3.1-1 - Upgrade
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Thunderbirdto a version that resolves this vulnerability.Fixed in 78.10 - Upgrade
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Firefoxto a version that resolves this vulnerability.Fixed in 88 - Upgrade
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Firefox ESRto a version that resolves this vulnerability.Fixed in 78.10 - Upgrade
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alpine/firefoxto a version that resolves this vulnerability.Fixed in 88.0-r0 - Upgrade
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alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 78.10.0-r0 - Upgrade
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alpine/librewolfto a version that resolves this vulnerability.Fixed in 88.0-r0 - Upgrade
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alpine/thunderbirdto a version that resolves this vulnerability.Fixed in 91.3.2-r0
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-29946.
What is the severity of CVE-2021-29946?
The severity of CVE-2021-29946 is low.
Which software products are affected by CVE-2021-29946?
Mozilla Thunderbird 78.10, Mozilla Firefox ESR 78.10, and Mozilla Firefox up to version 88 are affected by CVE-2021-29946.
What could happen due to CVE-2021-29946?
CVE-2021-29946 could result in the bypassing of port blocking restrictions when certain ports are used in the Alt-Svc header.
Where can I find more information about CVE-2021-29946?
More information about CVE-2021-29946 can be found at the following references: [1](https://bugzilla.mozilla.org/show_bug.cgi?id=1698503), [2](https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/), [3](https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/).