Out-of-bound write in tcp_flags

published 2022-08-31 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-25117

cvss: 7.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

In subsys/net/ip/tcp.c , function tcp_flags , when the incoming parameter flags is ECN or CWR , the buf will out-of-bounds write a byte zero.

Patch / fix

links 1

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-5c3j-p8… advisory

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

zephyrproject-rtos zephyr

Classification

Weakness

CWE-787 Out-of-bounds Write

References

github.com /zephyrproject-rtos/zephyr/security/advisories/GHSA-5c3j-p8cr-2pgh
patch, third-party-advisory

Sources

CVE List CVE-2022-1841
NVD CVE-2022-1841

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Summary