CVE-2023-25736Network attack vector

Undefined behavior via invalid DOM downcast

Published Jun 19, 2023 · Updated Dec 11, 2024

Invalid downcast in Firefox before 110 allows remote attackers to trigger undefined behavior through DOM table-selection processing. GetTableSelectionMode statically casts an nsHTMLDocument object to nsIContent before invoking IsHTMLElement, despite the object not deriving from nsIContent. The public report reproduces the condition only in a CFI-instrumented crashtest and states that runtime behavior appears unchanged, so no concrete data or service consequence is established.

CVSS severityUnavailable
Unscored
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid downcast in Firefox before 110 allows remote attackers to trigger undefined behavior through DOM table-selection processing. GetTableSelectionMode statically casts an nsHTMLDocument object to nsIContent before invoking IsHTMLElement, despite the object not deriving from nsIContent. The public report reproduces the condition only in a CFI-instrumented crashtest and states that runtime behavior appears unchanged, so no concrete data or service consequence is established.

The record

CVE
CVE-2023-25736
Published
Jun 19, 2023
Updated
Dec 11, 2024
Vendor
Mozilla
Product
Firefox
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2024Record 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

Published CVSS scores

No CVSS assessment is available in this record.

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

No sourced classifications are available.

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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