CVE-2023-52558 | OpenBSD 7.4 and 7.3 m_split() network buffer kernel crash

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.

Published: 2024-03-01 Last update: 2025-10-10 Assigner: 9119a7d8-5eab-497f-8521-727c672e3725 Source: 9119a7d8-5eab-497f-8521-727c672e3725
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-52558 is rated Low Risk (37.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.07%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-52558

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.30% 0.07% -0.23%
2 2025-11-18 0.07% 0.30% +0.22%
3 2025-04-15 — 0.07% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-52558

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-52558

Affected software / configurations for CVE-2023-52558

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

References for CVE-2023-52558

cvelogic Threat Intelligence