CVE-2023-0616: If a MIME email combines OpenPGP and OpenPGP MIME data in a certain way Thunderbird repeatedly attempts to pro

Q: How do I fix CVE-2023-0616?

thunderbird: upgrade to 102.8. Exact commands for each OS are on this page.

Q: Is CVE-2023-0616 being exploited?

CVE-2023-0616 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-0616 affect?

CVE-2023-0616 affects thunderbird. Severity is medium (CVSS 6.5). If a MIME email combines OpenPGP and OpenPGP MIME data in a certain way Thunderbird repeatedly attempts to process and display the message, which could cause Thunderbird's user interface to lock up and no longer respond to the user's action

Q: How urgent is CVE-2023-0616?

Priority 33/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2023-0616 is a medium-severity flaw (CVSS 6.5) affecting thunderbird. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

If a MIME email combines OpenPGP and OpenPGP MIME data in a certain way Thunderbird repeatedly attempts to process and display the message, which could cause Thunderbird's user interface to lock up and no longer respond to the user's actions. An attacker could send a crafted message with this structure to attempt a DoS attack. This vulnerability affects Thunderbird < 102.8.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-400, CWE-770
Published	2023-06-02
Last modified	2026-10-24

Publisher (CNA): Mozilla Corporation · Vendor: mozilla

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-02 17:15 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

mozilla thunderbird UPGRADE

Affected: < 102.8

Fixed in: 102.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy thunderbird || rpm -q thunderbird || thunderbird --version

2. UPGRADE to 102.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade thunderbird

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade thunderbird

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · sugar-calculator · FIXED · 47-14.fc46 · FEDORA-2026-38eeb9e279 · source

sudo dnf upgrade --advisory=FEDORA-2026-38eeb9e279

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Debian 12 · thunderbird · FIXED · 1:102.8.0-1

sudo apt update && sudo apt install --only-upgrade thunderbird dpkg --compare-versions "$(dpkg-query -W -f='${Version}' thunderbird)" ge "1:102.8.0-1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · thunderbird · FIXED · 1:102.8.0-1

sudo apt update && sudo apt install --only-upgrade thunderbird dpkg --compare-versions "$(dpkg-query -W -f='${Version}' thunderbird)" ge "1:102.8.0-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 7 · thunderbird · FIXED · thunderbird-102.8.0-2.el7_9

sudo dnf upgrade --advisory=RHSA-2023:0817 rpm -q thunderbird

RHEL 8 · thunderbird · FIXED · thunderbird-102.8.0-2.el8_7

sudo dnf upgrade --advisory=RHSA-2023:0821 rpm -q thunderbird

RHEL 8.1 Update Services for SAP Solutions · thunderbird · FIXED · thunderbird-102.8.0-2.el8_1

sudo dnf upgrade --advisory=RHSA-2023:0818 rpm -q thunderbird

RHEL 8.2 Advanced Update Support · thunderbird · FIXED · thunderbird-102.8.0-2.el8_2

sudo dnf upgrade --advisory=RHSA-2023:0819 rpm -q thunderbird

RHEL 8.2 Telecommunications Update Service · thunderbird · FIXED · thunderbird-102.8.0-2.el8_2

sudo dnf upgrade --advisory=RHSA-2023:0819 rpm -q thunderbird

Amazon Linux 2 · see advisory · FIXED · ALAS2-2023-1983 · source

sudo yum update --advisory=ALAS2-2023-1983

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-0616?

thunderbird: upgrade to 102.8. Exact commands for each OS are on this page.

Is CVE-2023-0616 being exploited?

CVE-2023-0616 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-0616 affect?

CVE-2023-0616 affects thunderbird. Severity is medium (CVSS 6.5). If a MIME email combines OpenPGP and OpenPGP MIME data in a certain way Thunderbird repeatedly attempts to process and display the message, which could cause Thunderbird's user interface to lock up and no longer respond to the user's action

How urgent is CVE-2023-0616?

Priority 33/100. No elevated risk signals yet.

Software pages

Mozilla Thunderbird vulnerabilities

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References

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