CVE-2023-27567
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash...
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash the kernel.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash the kernel.
- Record
CVE-2023-27567- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
CVE List No score
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash the kernel.
- Record
CVE-2023-27567- Weakness
- CWE-400
- Updated
- 2026-11-02
EUVDEUVD-2023-31316
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash the kernel.
- Record
EUVD-2023-31316- CVSS
- 0.0 None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-3v6w-73q2-w9pg
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash...
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash the kernel.
- Record
GHSA-3v6w-73q2-w9pg- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
OSV No score
In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash the kernel.
- Record
CVE-2023-27567- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-27567 is a high vulnerability (CVSS 7.5) in Openbsd, published March 3, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.76%, the 55th percentile. No source names a fixed version.
References
ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/013_tcp.patch.sig
github.com/openbsd/src/commit/0a543725ccdd2a01669122ce79bb67e66ede77f2
security.netapp.com/advisory/ntap-20230406-0001
nvd.nist.gov/vuln/detail/CVE-2023-27567