CVE-2026-1547: totolink a7000r_firmware Injection
CVSS: 9.8v3.1CriticalAnalyzed
Published 28-01-2026Last modified 23-02-2026
Vulnerability summary
CVE-2026-1547 is a critical (CVSS 9.8) Injection vulnerability in totolink a7000r_firmware. EPSS estimates a 3.05% chance of exploitation in the next 30 days, higher than 87.4% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
3.05%
0%100%
Low · +0.17 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 28-01-2026PublishedVulnerability first disclosed.
- 23-02-2026Last modifiedVulnerability information updated.
Description
A vulnerability was detected in Totolink A7000R 4.1cu.4154. This affects the function setUnloadUserData of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument plugin_name results in command injection. It is possible to launch the attack remotely. The exploit is now public and may be used.
CVSS metrics
7 scores · 2 sources · 4 versionsMedium 5.3Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:PSources2 sources · 2.1–5.3
- NVDNIST2.1LowCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XDiffers
Critical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSources2 sources · 6.3–9.8
- CVE.orgCNA6.3MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:RDiffers
Medium 6.3Preferred score · CVE.org (CNA)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:RSourcesSingle source
Medium 6.5Preferred score · CVE.org (CNA)
AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:URSourcesAll 2 agree
- NVDNIST6.5MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
EPSS trend
Probability
3.05%
Chance of exploitation in the next 30 days
Percentile
87%
Versus all other CVEs
30-day change
+0.17 pp
From 2.88% on 21-09-2026
21-09-202621-10-2026
EPSS score3.05%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundIot Poc
Maturity: poc
Weaknesses
CWE · root cause- CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
- CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
Affected systems
Totolink1 product
- a7000r_firmware4.1cu.4154
1 vendor · 1 product
References
6 links- github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A7000R/01_RCE_setUnloadUserData_RCE.mdExploitThird Party Advisory
- github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A7000R/01_RCE_setUnloadUserData_RCE.mdExploitThird Party Advisory
- www.totolink.netProduct