Read the docs
TI-2021-10574 Aliases CVE-2021-29957GHSA-5v9p-7pr9-r9pm

If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but…

Priority LOW 22Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Partial Red Hat: 6 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected. This vulnerability affects Thunderbird < 78.10.2.

Why it matters now

EPSS 0.0094 61st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Thunderbird (Mozilla): 78.10.2Red Hat: 4 advisoriesRed Hat: 6 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaThunderbirdbefore 78.10.278.10.2Patch availableCNA
  • Thunderbird VendorMozilla Affected before 78.10.2 Fixed in 78.10.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 78.10.2VulnerableMozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 78.10.2 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Thunderbird (Mozilla) Fixed in 78.10.2

Red Hat 4 advisories

  • RHSA-2021:2264 Released 2021-06-07 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-78.11.0-1.el8_4
  • RHSA-2021:2263 Released 2021-06-07 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-78.11.0-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-78.11.0-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-78.11.0-1.el7_9
  • RHSA-2021:2261 Released 2021-06-07 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird-78.11.0-1.el8_2
Show 1 more Red Hat advisories
  • RHSA-2021:2262 Released 2021-06-07 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.1) thunderbird-78.11.0-1.el8_1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Thunderbird 78.10.2

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2021-10573 Cleartext storage of sensitive information in Mozilla ThunderbirdPriority LOW 22
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:2264
Red Hat Enterprise Linux AppStream EUS (v. 8.1)Fixed RHSA-2021:2262
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2021:2261
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:2263
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:2263
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:2263

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29957
  2. 2026-10-03 Alias added: GHSA-5v9p-7pr9-r9pm

References

Exploit 1

Advisory 1

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 2067 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences