CVE-2022-29222Network attack vector

Client impersonation via missing CertificateVerify enforcement

Published May 21, 2022 · Updated Apr 23, 2025

Improper certificate validation in Pion DTLS before 2.1.5 allows remote attackers to impersonate clients using certificates they do not control. The flight4Parse handshake state machine accepted a received client certificate and initialized the cipher suite without requiring a CertificateVerify message proving possession of the matching private key. The flaw is reachable only on servers configured to use client certificates; the DTLS connection remains encrypted, but the asserted client identity cannot be trusted.

CVSS severity5.9
Medium
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Pion DTLS before 2.1.5 allows remote attackers to impersonate clients using certificates they do not control. The flight4Parse handshake state machine accepted a received client certificate and initialized the cipher suite without requiring a CertificateVerify message proving possession of the matching private key. The flaw is reachable only on servers configured to use client certificates; the DTLS connection remains encrypted, but the asserted client identity cannot be trusted.

The record

CVE
CVE-2022-29222
Published
May 21, 2022
Updated
Apr 23, 2025
Vendor
Pion
Product
Pion DTLS
Classifications
CWE-295, T1649
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 2.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pion · Pion DTLSversion=< 2.1.5

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NISTAV:N/AC:L/Au:N/C:N/I:P/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.

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

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

CWE-295Improper Certificate Validation
T1649Steal or Forge Authentication Certificates

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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