CVE-2021-27710
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.90%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a 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, "ip" parameter is directly passed to the attacker, allowing them to control the "ip" field to attack the OS.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 7.90% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- totolink/x5000r firmware · totolink/a720r firmware
- Source
- cve@mitre.org
EPSS 7.9% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://hackmd.io/Hy3oVgtcQiuqAtv9FdylHwExploit, Third Party Advisory
- https://hackmd.io/KjXzQdjDRjOuRjoZZXQo_AExploit, Third Party Advisory
- https://hackmd.io/Hy3oVgtcQiuqAtv9FdylHwExploit, Third Party Advisory
- https://hackmd.io/KjXzQdjDRjOuRjoZZXQo_AExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.