Vulnerability Monitor

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CVE-2020-22079

Stack-based buffer overflow in Tenda AC-10U AC1200 Router US_AC10UV1.0RTL_V15.03.06.48_multi_TDE01 allows remote attackers to execute arbitrary code via the timeZone parameter to goform/SetSysTimeCfg.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 4 products from tendacn, from tendacn, from tendacn and 1 other, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-10-29T11:15:08.310

Last Modified

2026-06-17T03:04:07.167

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	tendacn	ac10u_firmware	15.03.06.48_multi_tde01	Yes
Hardware	tendacn	ac10u	1.0	No
Operating System	tendacn	ac9_firmware	15.03.05.19\(6318\)	Yes
Hardware	tendacn	ac9	1.0	No
Operating System	tendacn	ac9_firmware	15.03.06.42_multi	Yes
Hardware	tendacn	ac9	3.0	No

References

https://cwe.mitre.org/data/definitions/121.html Technical Description ([email protected])
https://github.com/1sd3d/Tendown/tree/master/PoCs/Auth/bof11 Broken Link ([email protected])
https://github.com/Lyc-heng/routers/blob/main/routers/stack1.md Exploit, Third Party Advisory ([email protected])
https://cwe.mitre.org/data/definitions/121.html Technical Description (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/1sd3d/Tendown/tree/master/PoCs/Auth/bof11 Broken Link (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/Lyc-heng/routers/blob/main/routers/stack1.md Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For tendacn's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.