PT-2021-3780 · Tenda · Tenda Ac11

Published 2021-05-07 · Updated 2025-11-10 · CVE-2021-31755

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Tenda AC11 devices with firmware through 02.03.01.104 CN

Description The issue is related to a stack buffer overflow that allows attackers to execute arbitrary code on the system. This can be achieved via a crafted post request to the /goform/setmac API endpoint. The vulnerability is associated with a buffer overflow in memory, which can be exploited by a remote attacker to execute arbitrary code by sending POST requests.

Recommendations For Tenda AC11 devices with firmware through 02.03.01.104 CN, update the firmware to a version later than 02.03.01.104 CN to resolve the issue. As a temporary workaround, consider restricting access to the /goform/setmac API endpoint until a patch is available.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2021-04037

CVE-2021-31755

Affected Products

Tenda Ac11

References · 10

• 🔥❌ https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 · Exploit, Deleted
• https://bdu.fstec.ru/vul/2021-04037 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-31755 · Security Note
• https://osv.dev/vulnerability/CVE-2021-31755 · Vendor Advisory
• https://cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv · Note
• https://cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31755 · Note
• https://t.me/aptreports/14823 · Telegram Post
• https://t.me/cveNotify/142283 · Telegram Post
• https://blogs.juniper.net/en-us/security/freshly-disclosed-vulnerability-cve-2021-20090-exploited-in-the-wild · Note
• https://t.me/cvenotify/117627 · Telegram Post