How severe is CVE-2023-40216?

CVE-2023-40216 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-40216 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40216?

CVE-2023-40216 primarily affects Openbsd. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-40216?

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

When was CVE-2023-40216 published?

CVE-2023-40216 was published on 2023-08-10 and last updated on 2026-06-17.

CVE-2023-40216

CVE-2023-40216 is a medium-severity vulnerability in Openbsd with a CVSS 3.x base score of 5.5. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Openbsd
Published: 2023-08-10
Last modified: 2026-06-17

Description

OpenBSD 7.3 before errata 014 is missing an argument-count bounds check in console terminal emulation. This could cause incorrect memory access and a kernel crash after receiving crafted DCS or CSI terminal escape sequences.

Frequently asked questions

What is CVE-2023-40216?: OpenBSD 7.3 before errata 014 is missing an argument-count bounds check in console terminal emulation. This could cause incorrect memory access and a kernel crash after receiving crafted DCS or CSI terminal escape sequences.
How severe is CVE-2023-40216?: CVE-2023-40216 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-40216 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40216?: CVE-2023-40216 primarily affects Openbsd. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-40216?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-40216 published?: CVE-2023-40216 was published on 2023-08-10 and last updated on 2026-06-17.

References

Affected products (14)

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:*:*:*:*:*:*

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