CVE-2023-25742Network attack vector

Tab crash via mismatched Web Crypto key import

Published Jun 2, 2023 · Updated Jan 9, 2025

Denial of service in Firefox before 110, Firefox ESR before 102.8, and Thunderbird before 102.8 allows attackers to crash a tab. The Web Crypto ImportKey path incorrectly handles an SPKI-encoded RSA public key supplied for ECDSA P-256, terminating the content tab. Attackers must cause a browser or browser-like context to process the mismatched key; Thunderbird email reading is not a path because scripting is disabled.

CVSS severity6.5
Medium
EPSS probability0.65%
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 Firefox before 110, Firefox ESR before 102.8, and Thunderbird before 102.8 allows attackers to crash a tab. The Web Crypto ImportKey path incorrectly handles an SPKI-encoded RSA public key supplied for ECDSA P-256, terminating the content tab. Attackers must cause a browser or browser-like context to process the mismatched key; Thunderbird email reading is not a path because scripting is disabled.

The record

CVE
CVE-2023-25742
Published
Jun 2, 2023
Updated
Jan 9, 2025
Vendor
Mozilla
Product
Firefox
Classifications
T1499
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 <110

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <110
Mozilla · Thunderbirdversion=unspecified <102.8
Mozilla · Firefox ESRversion=unspecified <102.8

Published CVSS scores

6.5NIST NVDCVSS: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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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