CVE-2023-25746Network attack vector

Code execution via undisclosed memory corruption

Published Jun 2, 2023 · Updated Jan 9, 2025

Memory corruption in Mozilla Firefox ESR and Thunderbird before 102.8 allows remote attackers to execute code through crafted web content. Mozilla reports multiple memory-safety defects with evidence of corruption but has not disclosed the affected code loci or invalid memory operations. Exploitation requires user interaction with attacker-controlled content; Thunderbird mail reading is not a vector because scripting is disabled.

CVSS severity8.8
High
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Mozilla Firefox ESR and Thunderbird before 102.8 allows remote attackers to execute code through crafted web content. Mozilla reports multiple memory-safety defects with evidence of corruption but has not disclosed the affected code loci or invalid memory operations. Exploitation requires user interaction with attacker-controlled content; Thunderbird mail reading is not a vector because scripting is disabled.

The record

CVE
CVE-2023-25746
Published
Jun 2, 2023
Updated
Jan 9, 2025
Vendor
Mozilla
Product
Thunderbird
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 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
Mozilla · Firefox ESRversion=unspecified <102.8

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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