OpenBSD 7.2 TCP Packet tcp_input.c tcp_input denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in OpenBSD 7.2. This affects the function tcp_input of the file tcp_input.c of the component TCP Packet Handler. This manipulation causes denial of service. This vulnerability is handled as CVE-2023-27567. The attack can be initiated remotely. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as critical was found in OpenBSD 7.2 (Operating System). Affected by this vulnerability is the function tcp_input of the file tcp_input.c of the component TCP Packet Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

In OpenBSD 7.2, a TCP packet with destination port 0 that matches a pf divert-to rule can crash the kernel.

The weakness was released 03/04/2023. The advisory is shared at ftp.openbsd.org. This vulnerability is known as CVE-2023-27567 since 03/03/2023. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at ftp.openbsd.org.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-31316). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: ftp.openbsd.org

Timelineinfo

03/03/2023 🔍
03/04/2023 +1 days 🔍
03/04/2023 +0 days 🔍
11/17/2025 +989 days 🔍

Sourcesinfo

Advisory: 0a543725ccdd2a01669122ce79bb67e66ede77f2
Status: Confirmed

CVE: CVE-2023-27567 (🔍)
GCVE (CVE): GCVE-0-2023-27567
GCVE (VulDB): GCVE-100-222301
EUVD: 🔍

Entryinfo

Created: 03/04/2023 09:42
Updated: 11/17/2025 11:26
Changes: 03/04/2023 09:42 (40), 03/04/2023 09:43 (2), 03/31/2023 10:04 (1), 03/31/2023 10:07 (10), 11/17/2025 11:26 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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