What is CVE-2026-67822?

CVE-2026-67822 is a critical-severity vulnerability in N/a, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-07-31.

How severe is CVE-2026-67822?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-67822 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in N/a

CVE-2026-67822

Tenda W6-S 1.0.0.4(510) contains a stack-based buffer overflow vulnerability in the /goform/wifiSSIDset endpoint. The function formwrlSSIDset uses sprintf to copy user-controlled 'GO' and 'index' parameters into a 64-byte stack buffer without length restriction, leading to stack overflow.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (23.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

Public proof-of-concept exploits

Hunt-Benito/go-without-bounds-cve-2026-67822-stack-overflow-in-tenda-w6-s-wifissidset

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-67822?: CVE-2026-67822 is a critical-severity vulnerability in N/a, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-07-31.
How severe is CVE-2026-67822?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-67822 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.