TI-2020-12321 Aliases CVE-2020-15646 GHSA-4w45-xx62-4547

If an attacker intercepts Thunderbird's initial attempt to perform automatic account…

LOW 28Published 2020-10-08 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: High · None · None
Fix status: Partial Red Hat: 9 fixed, 1 without a fix

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

Summary

If an attacker intercepts Thunderbird's initial attempt to perform automatic account setup using the Microsoft Exchange autodiscovery mechanism, and the attacker sends a crafted response, then Thunderbird sends username and password over https to a server controlled by the attacker. This vulnerability affects Thunderbird < 68.10.0.

Why it matters now

EPSS 0.00961 61st percentileScored 2026-11-08

Fix Partial Thunderbird (Mozilla): 68.10.0Red Hat: 5 advisoriesRed Hat: 9 fixed, 1 without a fix

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Thunderbird	before 68.10.0	68.10.0	Patch available	CNA

Thunderbird VendorMozilla Affected before 68.10.0 Fixed in 68.10.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:thunderbird::::::::	before 68.10.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 68.10.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Thunderbird (Mozilla) Fixed in 68.10.0

Red Hat 5 advisories

RHSA-2020:3038 Released 2020-07-21 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-68.10.0-1.el8_2
RHSA-2020:3046 Released 2020-07-21 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) thunderbird-68.10.0-1.el8_0
RHSA-2020:2966 Released 2020-07-16 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-68.10.0-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-68.10.0-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-68.10.0-1.el6_10

Show 2 more Red Hat advisories

RHSA-2020:2906 Released 2020-07-14 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-68.10.0-1.el7_8
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-68.10.0-1.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-68.10.0-1.el7_8
RHSA-2020:2907 Released 2020-07-14 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.1) thunderbird-68.10.0-1.el8_1

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 5	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)	Fixed	RHSA-2020:3038
Red Hat Enterprise Linux AppStream E4S (v. 8.0)	Fixed	RHSA-2020:3046
Red Hat Enterprise Linux AppStream EUS (v. 8.1)	Fixed	RHSA-2020:2907
Red Hat Enterprise Linux Client (v. 7)	Fixed	RHSA-2020:2906
Red Hat Enterprise Linux Desktop (v. 6)	Fixed	RHSA-2020:2966
Red Hat Enterprise Linux Server Optional (v. 6)	Fixed	RHSA-2020:2966
Red Hat Enterprise Linux Server Optional (v. 7)	Fixed	RHSA-2020:2906
Red Hat Enterprise Linux Workstation (v. 6)	Fixed	RHSA-2020:2966
Red Hat Enterprise Linux Workstation (v. 7)	Fixed	RHSA-2020:2906

Timeline

2026-10-02 Threatist record created from CVE-2020-15646
2026-10-03 Alias added: GHSA-4w45-xx62-4547

References

Advisory 2

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