CVE-2022-1343Network attack vector

Invalid OCSP response trust via overwritten failure return

Published May 3, 2022 · Updated May 5, 2025

Improper certificate validation in OpenSSL 3.0.0 through 3.0.2 allows attackers to treat an invalid OCSP response as trusted. In OCSP_basic_verify, ocsp_verify_signer overwrites X509_verify_cert's failure return with a positive X509 error code, so OCSP_NOCHECKS bypasses the later empty-chain failure. Reachability requires the non-default OCSP_NOCHECKS flag or command-line -no_cert_checks option; the result is false acceptance of an unverified response.

CVSS severity5.3
Medium
EPSS probability1.21%
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 OpenSSL 3.0.0 through 3.0.2 allows attackers to treat an invalid OCSP response as trusted. In OCSP_basic_verify, ocsp_verify_signer overwrites X509_verify_cert's failure return with a positive X509 error code, so OCSP_NOCHECKS bypasses the later empty-chain failure. Reachability requires the non-default OCSP_NOCHECKS flag or command-line -no_cert_checks option; the result is false acceptance of an unverified response.

The record

CVE
CVE-2022-1343
Published
May 3, 2022
Updated
May 5, 2025
Vendor
OpenSSL Project
Product
OpenSSL
Classifications
CWE-295, T1553
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2022CVE publishedPublication date reported by the CVE source.
  2. May 5, 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=Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSSL Project · OpenSSLversion=Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2)

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 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
T1553Subvert Trust Controls

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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