CVE-2021-27708

Public Exploit

Description

Command Injection in TOTOLINK X5000R router with firmware v9.1.0u.6118_B20201102, and TOTOLINK A720R router with firmware v4.1.5cu.470_B20200911 allows remote attackers to execute arbitrary OS commands by sending a modified HTTP request. This occurs because the function executes glibc's system function with untrusted input. In the function, "command" parameter is directly passed to the attacker, allowing them to control the "command" field to attack the OS.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 20.15% Top 5%
Third-Party Advisory hackmd.io Third-Party Advisory hackmd.io
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://hackmd.io/7FtB06f-SJ-SCfkMYcXYxA third party advisory exploit
https://hackmd.io/mDgIBvoxSPCZrZiZjfQGhw third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-27708?
CVE-2021-27708 has been scored as a critical severity vulnerability.
How to fix CVE-2021-27708?
To fix CVE-2021-27708, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-27708 being actively exploited in the wild?
It is possible that CVE-2021-27708 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~20% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.