What is CVE-2021-27705?

CVE-2021-27705 is a critical-severity vulnerability in Tenda G1, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-04-14.

How severe is CVE-2021-27705?

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

Buffer overflow in Tenda G1

CVE-2021-27705

Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/"qosIndex "request. This occurs because the "formQOSRuleDel" function directly passes the…

Vulnerability class: Buffer Overflow

EPSS: 0.029 (85.4th 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

Tenda G1
Tenda G1_firmware — versions v15.11.0.17\(9502\)_cn
Tenda G3
Tenda G3_firmware — versions v15.11.0.17\(9502\)_cn
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-27705?: CVE-2021-27705 is a critical-severity vulnerability in Tenda G1, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-04-14.
How severe is CVE-2021-27705?: Critical severity. CVSS v3 base score is 9.8 out of 10.