CVE-2023-0616Network attack vector

Interface lockup via recursive OpenPGP MIME processing

Published Jun 2, 2023 · Updated Jan 10, 2025

Denial of service in Mozilla Thunderbird before 102.8 allows remote attackers to lock its interface via a crafted OpenPGP MIME email. The MIME display path repeatedly attempts to process a message that combines nested OpenPGP and OpenPGP MIME data. The recipient must display the message, after which the interface stops responding to user actions.

CVSS severity6.5
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Mozilla Thunderbird before 102.8 allows remote attackers to lock its interface via a crafted OpenPGP MIME email. The MIME display path repeatedly attempts to process a message that combines nested OpenPGP and OpenPGP MIME data. The recipient must display the message, after which the interface stops responding to user actions.

The record

CVE
CVE-2023-0616
Published
Jun 2, 2023
Updated
Jan 10, 2025
Vendor
Mozilla
Product
Thunderbird
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <102.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Thunderbirdversion=unspecified <102.8

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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