CVE-2022-25640Network attack vector

Authentication bypass via omitted CertificateVerify message

Published Feb 24, 2022 · Updated Aug 3, 2024

Authentication bypass in wolfSSL before 5.2.0 allows remote attackers to complete a TLS 1.3 mutual-authentication handshake without a certificate. DoTls13Finished accepted the client's Finished message without requiring both havePeerCert and havePeerVerify when mutual authentication was configured. A reachable TLS 1.3 server must require client certificates; omitting CertificateVerify then grants access as an authenticated client.

CVSS severity7.5
High
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in wolfSSL before 5.2.0 allows remote attackers to complete a TLS 1.3 mutual-authentication handshake without a certificate. DoTls13Finished accepted the client's Finished message without requiring both havePeerCert and havePeerVerify when mutual authentication was configured. A reachable TLS 1.3 server must require client certificates; omitting CertificateVerify then grants access as an authenticated client.

The record

CVE
CVE-2022-25640
Published
Feb 24, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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 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

CWE-295Improper Certificate Validation

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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