CVE-2022-31741Public exploitNetwork attack vector

Memory corruption via uninitialized CMS digest pointer

Published Dec 22, 2022 · Updated Apr 15, 2025

Invalid reads in Firefox before 101, Firefox ESR before 91.10, and Thunderbird before 91.10 allow attackers to crash clients via crafted CMS data. NSS_CMSDigestContext_FinishMultiple returns success without initializing its digest output when no content was seen, causing a caller to dereference stale stack data. User-triggered processing of attacker-supplied CMS data is required; observed outcomes are invalid reads and crashes, while stack grooming yields an arbitrary memory read.

CVSS severity8.8
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid reads in Firefox before 101, Firefox ESR before 91.10, and Thunderbird before 91.10 allow attackers to crash clients via crafted CMS data. NSS_CMSDigestContext_FinishMultiple returns success without initializing its digest output when no content was seen, causing a caller to dereference stale stack data. User-triggered processing of attacker-supplied CMS data is required; observed outcomes are invalid reads and crashes, while stack grooming yields an arbitrary memory read.

The record

CVE
CVE-2022-31741
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-908, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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 <101

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <101
Mozilla · Thunderbirdversion=unspecified <91.10
Mozilla · Firefox ESRversion=unspecified <91.10

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1203Exploitation for Client Execution

Public exploit references

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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