How severe is CVE-2023-53159?

CVE-2023-53159 has a CVSS 3.x base score of 4.5, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2023-53159 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-53159?

CVE-2023-53159 affects Sfackler Openssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-53159?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-53159 have an EU (EUVD) identifier?

Yes. CVE-2023-53159 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-59771.

When was CVE-2023-53159 published?

CVE-2023-53159 was published on 2025-07-28 and last updated on 2026-06-17.

CVE-2023-53159

CVE-2023-53159 is a medium-severity vulnerability in Sfackler Openssl with a CVSS 3.x base score of 4.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-126.

Key facts

Severity: Medium (CVSS 3.x base score 4.5)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-59771
Weakness: CWE-126
Affected product: Sfackler Openssl
Published: 2025-07-28
Last modified: 2026-06-17

Description

The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host.

Frequently asked questions

What is CVE-2023-53159?: The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host.
How severe is CVE-2023-53159?: CVE-2023-53159 has a CVSS 3.x base score of 4.5, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2023-53159 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-53159?: CVE-2023-53159 affects Sfackler Openssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-53159?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-53159 have an EU (EUVD) identifier?: Yes. CVE-2023-53159 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-59771.
When was CVE-2023-53159 published?: CVE-2023-53159 was published on 2025-07-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sfackler:openssl:*:*:*:*:*:rust:*:*

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