CVE-2023-0217

NULL dereference validating DSA public key

Published Feb 8, 2023 CVSS 3.1 · 7.5 High EPSS 1.8% KEV · Not listed
Description
An invalid pointer dereference on read can be triggered when an
application tries to check a malformed DSA public key by the
EVP_PKEY_public_check() function. This will most likely lead
to an application crash. This function can be called on public
keys supplied from untrusted sources which could allow an attacker
to cause a denial of service attack.

The TLS implementation in OpenSSL does not call this function
but applications might call the function if there are additional
security requirements imposed by standards such as FIPS 140-3.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-vxrh-cpg7-8vjr openssl-src subject to NULL dereference validating DSA public key
Ubuntu USN Ubuntu USN USN-5844-1 OpenSSL vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description An invalid pointer dereference on read can be triggered when an application tries to check a malformed DSA public key by the EVP_PKEY_public_check() function. This will most likely lead to an application crash. This function can be called on public keys supplied from untrusted sources which could allow an attacker to cause a denial of service attack. The TLS implementation in OpenSSL does not call this function but applications might call the function if there are additional security requirements imposed by standards such as FIPS 140-3. An invalid pointer dereference on read can be triggered when an application tries to check a malformed DSA public key by the EVP_PKEY_public_check() function. This will most likely lead to an application crash. This function can be called on public keys supplied from untrusted sources which could allow an attacker to cause a denial of service attack. The TLS implementation in OpenSSL does not call this function but applications might call the function if there are additional security requirements imposed by standards such as FIPS 140-3.
Weaknesses

Sources

Status
PUBLISHED
Assigner
openssl
Published
Updated
Nov 4, 2025, 7:14 PM
Reserved
Jan 11, 2023, 12:02 PM
Status
Modified
Published
Feb 8, 2023, 8:15 PM
Modified
Jun 17, 2026, 5:25 AM
Severity
Moderate
Public date
Feb 7, 2023, 12:00 AM