PT-2021-17610 · Tenda · Tenda G3+1

Jinwen Zhou + 2 · Published 2021-04-14 · Updated 2021-04-20 · CVE-2021-27707

Positive Technologies (AI Summary)

CVSS v3.1

9.8

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 G1 and G3 routers version v15.11.0.17(9502) CN

Description: The issue allows remote attackers to execute arbitrary code via a crafted action/"portMappingIndex" request. This occurs because the formDelPortMapping function directly passes the parameter portMappingIndex to strcpy without limit.

Recommendations: For Tenda G1 and G3 routers version v15.11.0.17(9502) CN, as a temporary workaround, consider restricting access to the formDelPortMapping function until a patch is available. Avoid using the parameter portMappingIndex in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

CVE-2021-27707

Affected Products

Tenda G1

Tenda G3

References · 5

• 🔥 https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-27707 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27707 · Vendor Advisory
• https://t.me/cvenotify/13214 · Telegram Post
• https://t.me/cvenotify/13212 · Telegram Post