CVE-2023-52556

MEDIUMNVD 6.26.2—

6.2

In OpenBSD 7.4 before errata 009, a race condition between pf(4)'s processing of packets and expiration of packet states may cause a kernel panic.

CVSS v3: 6.2
EG Score: 6.2(medium)
EPSS: 5.2%
KEV: Not listed

Published

March 1, 2024

Last Modified

October 10, 2025

References (4)

9119a7d8-5eab-497f-8521-727c672e3725https://ftp.openbsd.org/pub/OpenBSD/patches/7.4/common/009_pf.patch.sig
9119a7d8-5eab-497f-8521-727c672e3725https://github.com/openbsd/src/commit/9d9f4dc6c833cb79d13f836581e3a781d06842e7
af854a3a-2127-422b-91ae-364da2661108https://ftp.openbsd.org/pub/OpenBSD/patches/7.4/common/009_pf.patch.sig
af854a3a-2127-422b-91ae-364da2661108https://github.com/openbsd/src/commit/9d9f4dc6c833cb79d13f836581e3a781d06842e7

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition

Data Freshness Timeline

(refreshed 10× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 07:27 UTCEG score recompute
2026-05-24 07:27 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-52556?

CVE-2023-52556 is a medium vulnerability published on March 1, 2024. In OpenBSD 7.4 before errata 009, a race condition between pf(4)'s processing of packets and expiration of packet states may cause a kernel panic.

When was CVE-2023-52556 disclosed?

CVE-2023-52556 was first published in the National Vulnerability Database on March 1, 2024, with the most recent update on October 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-52556 actively exploited?

CVE-2023-52556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-52556?

CVE-2023-52556 has a CVSS v3 base score of 6.2 (NVD).

How do I remediate CVE-2023-52556?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-52556, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2023-52556

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-52556?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)