Security readout for executives and security teams
Plain-English summary
CVE-2023-0217 is an OpenSSL crash issue. If an application checks an untrusted malformed DSA public key using a specific OpenSSL function, the process can crash. The OpenSSL TLS stack does not call this function, so exposure depends on application-level key validation, especially where extra standards-driven checks are used.
Executive priority
Treat as high priority for systems that process externally supplied public keys using OpenSSL 3.0.0-era libraries. It is mainly an availability risk, but a crash in authentication, enrollment, or compliance validation services can still create business disruption.
Technical view
A NULL pointer read dereference can occur in EVP_PKEY_public_check() while validating malformed DSA public keys. The likely impact is denial of service through application crash. Sources identify OpenSSL 3.0.0 and a 3.0.8 patch commit; downstream exposure depends on packaged OpenSSL versions and application code paths calling this API on untrusted keys.
Likely exposure
Internet-facing services are exposed only if they accept untrusted DSA public keys and pass them to EVP_PKEY_public_check(). Standard OpenSSL TLS handling is not identified as affected by this call path. FIPS 140-3 or similar validation workflows deserve priority review.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation is described as malformed public-key input causing a crash, not code execution. Practical risk is service disruption where vulnerable application code validates attacker-supplied DSA public keys.
Researcher notes
Focus analysis on application use of EVP_PKEY_public_check(), not generic TLS exposure. The bundle states OpenSSL TLS does not call this function. Affected scope beyond the listed OpenSSL version should be confirmed through vendor advisories and package metadata before reporting exposure.
Mitigation direction
- Upgrade OpenSSL according to the OpenSSL advisory and downstream vendor guidance.
- Prioritize systems using OpenSSL 3.0.0 or downstream packages flagged by vendors.
- Review applications that call EVP_PKEY_public_check() on untrusted public keys.
- Add defensive error handling around public-key validation paths.
- Track distro and appliance advisories, including Gentoo and SonicWall references.
Validation and detection
- Inventory OpenSSL versions in hosts, containers, appliances, and bundled dependencies.
- Identify code paths using EVP_PKEY_public_check() with DSA public keys.
- Confirm whether untrusted users can submit public keys to those paths.
- Run safe regression tests confirming malformed keys fail without process crash.
- Verify patched builds include the OpenSSL 3.0.8 fix or vendor equivalent.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2023-0217 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- OpenSSL AdvisoryCVE reference · vendor-advisory
- 3.0.8 git commitCVE reference · patch
- https://security.gentoo.org/glsa/202402-08CVE reference
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0003CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.