CVE-2026-31177: totolink a3300r_firmware OS Command Injection
CVSS: 9.8v3.1CriticalAnalyzed
Published 23-04-2026Last modified 23-04-2026
Vulnerability summary
CVE-2026-31177 is a critical (CVSS 9.8) OS Command Injection vulnerability in totolink a3300r_firmware. EPSS estimates a 1.45% chance of exploitation in the next 30 days, higher than 73.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
1.45%
0%100%
Low · +0.85 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 23-04-2026PublishedVulnerability first disclosed.
- 23-04-2026Last modifiedVulnerability information updated.
Description
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the stunMinAlive parameter to /cgi-bin/cstecgi.cgi.
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.45%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
+0.85 pp
From 0.60% on 21-09-2026
21-09-202621-10-2026
EPSS score1.45%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundTotolink Vul
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Totolink1 product
- a3300r_firmware17.0.0cu.557_b20221024
1 vendor · 1 product
References
1 links- github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-stun-min-alive-cmd-injectionExploitThird Party Advisory