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CVE-2021-43537

Medium priority

Some fixes available 17 of 27

An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

7 affected packages

firefox, firefox-esr, mozjs38, mozjs52, mozjs68...

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
firefox Fixed Fixed Fixed Fixed
firefox-esr Not in release Not in release Not in release Not in release
mozjs38 Not in release Not in release Not in release Ignored
mozjs52 Not in release Not in release Ignored Ignored
mozjs68 Not in release Not in release Ignored Not in release
mozjs78 Not in release Ignored Not in release Not in release
thunderbird Fixed Fixed Fixed Fixed
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CVE-2021-43536

Medium priority

Some fixes available 17 of 27

Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

7 affected packages

firefox, firefox-esr, mozjs38, mozjs52, mozjs68...

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
firefox Fixed Fixed Fixed Fixed
firefox-esr Not in release Not in release Not in release Not in release
mozjs38 Not in release Not in release Not in release Ignored
mozjs52 Not in release Not in release Ignored Ignored
mozjs68 Not in release Not in release Ignored Not in release
mozjs78 Not in release Ignored Not in release Not in release
thunderbird Fixed Fixed Fixed Fixed
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CVE-2021-43528

Low priority

Some fixes available 6 of 7

Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack...

1 affected package

thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
thunderbird Fixed Fixed Fixed
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CVE-2021-43527

High priority
Fixed

NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling signatures encoded within CMS, S/MIME,...

2 affected packages

nss, thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nss Fixed Fixed Fixed
thunderbird Fixed Fixed Fixed
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CVE-2021-38502

Medium priority

Some fixes available 6 of 7

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute...

1 affected package

thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
thunderbird Fixed Fixed Fixed
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CVE-2021-38501

Medium priority

Some fixes available 17 of 27

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to...

6 affected packages

firefox, mozjs38, mozjs52, mozjs68, mozjs78, thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
firefox Fixed Fixed Fixed Fixed
mozjs38 Not in release Not in release Not in release Ignored
mozjs52 Not in release Not in release Ignored Ignored
mozjs68 Not in release Not in release Ignored Not in release
mozjs78 Not in release Ignored Not in release Not in release
thunderbird Fixed Fixed Fixed Fixed
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CVE-2021-38500

Medium priority

Some fixes available 17 of 27

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to...

6 affected packages

firefox, mozjs38, mozjs52, mozjs68, mozjs78, thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
firefox Fixed Fixed Fixed Fixed
mozjs38 Not in release Not in release Not in release Ignored
mozjs52 Not in release Not in release Ignored Ignored
mozjs68 Not in release Not in release Ignored Not in release
mozjs78 Not in release Ignored Not in release Not in release
thunderbird Fixed Fixed Fixed Fixed
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CVE-2021-38498

Medium priority

Some fixes available 17 of 27

During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.2,...

6 affected packages

firefox, mozjs38, mozjs52, mozjs68, mozjs78, thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
firefox Fixed Fixed Fixed Fixed
mozjs38 Not in release Not in release Not in release Ignored
mozjs52 Not in release Not in release Ignored Ignored
mozjs68 Not in release Not in release Ignored Not in release
mozjs78 Not in release Ignored Not in release Not in release
thunderbird Fixed Fixed Fixed Fixed
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CVE-2021-38497

Medium priority

Some fixes available 17 of 27

Through use of reportValidity() and window.open(), a plain-text validation message could have been overlaid on another origin, leading to possible user confusion and spoofing attacks. This vulnerability affects Firefox < 93,...

6 affected packages

firefox, mozjs38, mozjs52, mozjs68, mozjs78, thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
firefox Fixed Fixed Fixed Fixed
mozjs38 Not in release Not in release Not in release Ignored
mozjs52 Not in release Not in release Ignored Ignored
mozjs68 Not in release Not in release Ignored Not in release
mozjs78 Not in release Ignored Not in release Not in release
thunderbird Fixed Fixed Fixed Fixed
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CVE-2021-38496

Medium priority

Some fixes available 17 of 27

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2,...

6 affected packages

firefox, mozjs38, mozjs52, mozjs68, mozjs78, thunderbird

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
firefox Fixed Fixed Fixed Fixed
mozjs38 Not in release Not in release Not in release Ignored
mozjs52 Not in release Not in release Ignored Ignored
mozjs68 Not in release Not in release Ignored Not in release
mozjs78 Not in release Ignored Not in release Not in release
thunderbird Fixed Fixed Fixed Fixed
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