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CVE-2024-8394· NVD / CVE Program· CNA mozilla

When aborting the verification of an OTR chat session, an attacker could have caused a use-after-free bug leading to a potentially exploitab

When aborting the verification of an OTR chat session, an attacker could have caused a use-after-free bug leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 128.2.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Sep 6, 2024
Updated
Jun 17, 2026
EPSS
0.3% · 24th percentile
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JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
mozillathunderbird

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla thunderbirdbefore 128.2.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Thunderbird

    • unspecified and later · before 128.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8thunderbirdbefore 128.2.0-1.el8_10.alma.1128.2.0-1.el8_10.alma.1
AlmaLinux:9thunderbirdbefore 128.2.0-1.el9_4.alma.1128.2.0-1.el9_4.alma.1
Debian:13thunderbirdbefore 1:128.2.0esr-11:128.2.0esr-1
Red Hat:enterprise_linux:8::appstreamthunderbirdbefore 0:128.2.0-1.el8_100:128.2.0-1.el8_10
Red Hat:enterprise_linux:8::appstreamthunderbird-debuginfobefore 0:128.2.0-1.el8_100:128.2.0-1.el8_10
Red Hat:enterprise_linux:8::appstreamthunderbird-debugsourcebefore 0:128.2.0-1.el8_100:128.2.0-1.el8_10
Red Hat:enterprise_linux:9::appstreamthunderbirdbefore 0:128.2.0-1.el9_40:128.2.0-1.el9_4
Red Hat:enterprise_linux:9::appstreamthunderbird-debuginfobefore 0:128.2.0-1.el9_40:128.2.0-1.el9_4
Red Hat:enterprise_linux:9::appstreamthunderbird-debugsourcebefore 0:128.2.0-1.el9_40:128.2.0-1.el9_4
Red Hat:rhel_aus:8.2::appstreamthunderbirdbefore 0:128.2.0-1.el8_20:128.2.0-1.el8_2
Red Hat:rhel_aus:8.2::appstreamthunderbird-debuginfobefore 0:128.2.0-1.el8_20:128.2.0-1.el8_2
Red Hat:rhel_aus:8.2::appstreamthunderbird-debugsourcebefore 0:128.2.0-1.el8_20:128.2.0-1.el8_2
Red Hat:rhel_aus:8.4::appstreamthunderbirdbefore 0:128.2.0-1.el8_40:128.2.0-1.el8_4
Red Hat:rhel_aus:8.4::appstreamthunderbird-debuginfobefore 0:128.2.0-1.el8_40:128.2.0-1.el8_4
Red Hat:rhel_aus:8.4::appstreamthunderbird-debugsourcebefore 0:128.2.0-1.el8_40:128.2.0-1.el8_4
Red Hat:rhel_e4s:9.0::appstreamthunderbirdbefore 0:128.2.0-1.el9_00:128.2.0-1.el9_0
Red Hat:rhel_e4s:9.0::appstreamthunderbird-debuginfobefore 0:128.2.0-1.el9_00:128.2.0-1.el9_0
Red Hat:rhel_e4s:9.0::appstreamthunderbird-debugsourcebefore 0:128.2.0-1.el9_00:128.2.0-1.el9_0
Red Hat:rhel_eus:8.8::appstreamthunderbirdbefore 0:128.2.0-1.el8_80:128.2.0-1.el8_8
Red Hat:rhel_eus:8.8::appstreamthunderbird-debuginfobefore 0:128.2.0-1.el8_80:128.2.0-1.el8_8
Red Hat:rhel_eus:8.8::appstreamthunderbird-debugsourcebefore 0:128.2.0-1.el8_80:128.2.0-1.el8_8
Red Hat:rhel_eus:9.2::appstreamthunderbirdbefore 0:128.2.0-1.el9_20:128.2.0-1.el9_2
Red Hat:rhel_eus:9.2::appstreamthunderbird-debuginfobefore 0:128.2.0-1.el9_20:128.2.0-1.el9_2
Red Hat:rhel_eus:9.2::appstreamthunderbird-debugsourcebefore 0:128.2.0-1.el9_20:128.2.0-1.el9_2

+5

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-11705A flaw in Thunderbird's implementation of iCal causes a stack buffer overflow in icalrecur_add_bydayrules when processing certain email mess
    42Plan
  • CVE-2019-11704A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in icalmemory_strdup_and_dequote when processing certain email
    42Plan
  • CVE-2019-11703A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages,
    42Plan
  • CVE-2015-2740Buffer overflow in the nsXMLHttpRequest::AppendToResponseText function in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x
    42Plan
  • CVE-2013-5603Use-after-free vulnerability in the nsContentUtils::ContentIsHostIncludingDescendantOf function in Mozilla Firefox before 25.0, Firefox ESR
    42Plan
  • CVE-2013-1719Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 24.0, Thunderbird before 24.0, and SeaMonkey before 2.2
    42Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:thunderbird128.2.0-1.el9_4.alma.1 · AlmaLinux:9Package registry (OSV)
debian:thunderbird1:128.2.0esr-1 · Debian:13Package registry (OSV)
red hat:thunderbird0:128.2.0-1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debuginfo0:128.2.0-1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debugsource0:128.2.0-1.el9_4 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:thunderbird0:128.2.0-1.el9_4.0.1 · Rocky Linux:9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records