CVE-2022-3479Network attack vector

Client crash via certificate-request handling

Published Oct 14, 2022 · Updated Nov 20, 2024

Denial of service in Mozilla Network Security Services 3.81 allows remote attackers to crash NSS clients through a malicious TLS server. The crash occurs when the server requests a client-authentication certificate and the client's certificate database contains no user certificate; public records do not identify the faulting function or invalid memory operation. The client must initiate a TLS connection to the attacker-controlled server, and successful exploitation terminates the NSS-using process without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.76%
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 Network Security Services 3.81 allows remote attackers to crash NSS clients through a malicious TLS server. The crash occurs when the server requests a client-authentication certificate and the client's certificate database contains no user certificate; public records do not identify the faulting function or invalid memory operation. The client must initiate a TLS connection to the attacker-controlled server, and successful exploitation terminates the NSS-using process without reported data disclosure or modification.

The record

CVE
CVE-2022-3479
Published
Oct 14, 2022
Updated
Nov 20, 2024
Vendor
Mozilla
Product
Network Security Services (NSS)
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 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?

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  1. Affected versionversion=3.81

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Network Security Services (NSS)version=3.81

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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