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TI-2021-10565 Aliases CVE-2021-29948GHSA-7h9q-985f-8xvm

Race condition in Mozilla Thunderbird

Priority LOW 13CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
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

Signatures are written to disk before and read during verification, which might be subject to a race condition when a malicious local process or user is replacing the file. This vulnerability affects Thunderbird < 78.10.

Why it matters now

EPSS 0.00286 21st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Thunderbird (Mozilla): 78.10Red 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 78.1078.10Patch availableCNA
  • Thunderbird VendorMozilla Affected before 78.10 Fixed in 78.10 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 78.10VulnerableMozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 78.10 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Thunderbird (Mozilla) Fixed in 78.10

Red Hat 4 advisories

  • RHSA-2021:1350 Released 2021-04-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-78.10.0-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-78.10.0-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-78.10.0-1.el7_9
  • RHSA-2021:1352 Released 2021-04-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird-78.10.0-1.el8_2
  • RHSA-2021:1351 Released 2021-04-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.1) thunderbird-78.10.0-1.el8_1
Show 1 more Red Hat advisories
  • RHSA-2021:1353 Released 2021-04-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-78.10.0-1.el8_3

Fixed in the same release

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

  • Release ·

    Mozilla Thunderbird 78.10

    8 records Highest priority Priority MEDIUM 5 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2021-06313 Missing initialization of resource in Mozilla Firefox ESRPriority MEDIUM 42
    • TI-2021-10563 Integer overflow in Mozilla Firefox ESRPriority MEDIUM 41
    • TI-2021-06318 Improper privilege management in Mozilla Firefox ESRPriority MEDIUM 41
    Show all 8 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-2021:1353
Red Hat Enterprise Linux AppStream EUS (v. 8.1)Fixed RHSA-2021:1351
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2021:1352
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:1350
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:1350
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:1350

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29948
  2. 2026-10-03 Alias added: GHSA-7h9q-985f-8xvm

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