How severe is CVE-2023-52558?

CVE-2023-52558 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-52558 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-52558?

CVE-2023-52558 primarily affects Openbsd. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-52558?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-52558 have an EU (EUVD) identifier?

Yes. CVE-2023-52558 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-57182.

When was CVE-2023-52558 published?

CVE-2023-52558 was published on 2024-03-01 and last updated on 2026-06-17.

CVE-2023-52558

CVE-2023-52558 is a high-severity vulnerability in Openbsd with a CVSS 3.x base score of 7.5. 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-131.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-57182
Weakness: CWE-131
Affected product: Openbsd
Published: 2024-03-01
Last modified: 2026-06-17

Description

In OpenBSD 7.4 before errata 002 and OpenBSD 7.3 before errata 019, a network buffer that had to be split at certain length that could crash the kernel after receiving specially crafted escape sequences.

Frequently asked questions

What is CVE-2023-52558?: In OpenBSD 7.4 before errata 002 and OpenBSD 7.3 before errata 019, a network buffer that had to be split at certain length that could crash the kernel after receiving specially crafted escape sequences.
How severe is CVE-2023-52558?: CVE-2023-52558 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-52558 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-52558?: CVE-2023-52558 primarily affects Openbsd. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-52558?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-52558 have an EU (EUVD) identifier?: Yes. CVE-2023-52558 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-57182.
When was CVE-2023-52558 published?: CVE-2023-52558 was published on 2024-03-01 and last updated on 2026-06-17.

References

Affected products (22)

cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:-:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_001:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_002:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_003:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_004:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_005:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_006:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_007:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_008:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_009:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_010:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_011:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_012:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_013:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_014:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_015:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_016:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_017:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.3:errata_018:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.4:-:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:7.4:errata_001:*:*:*:*:*:*

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