CVE-2026-1623
Confirmed PUBLISHEDTotolink A7000R cstecgi.cgi setUpgradeFW command injection
Recommended Action
Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
At a Glance
A weakness has been identified in Totolink A7000R 4.1cu.4154. Impacted is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument FileName causes command injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.
- CVE Published
- Jan 29, 2026
- Exploitation Reported
- Jul 30, 2026
- CVSS
- 5.3 Medium
- EPSS
- 2.2%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Totolink |
A7000R
|
4.1cu.4154 |
Affected |
CVE References
- GitHub — xyh4ck/iot_poc github.com · Patch https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A7000R/04_RCE_se...
- GitHub — xyh4ck/iot_poc github.com · Patch https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A7000R/04_RCE_se...
- Submit #740767 | TOTOLINK A7000R V4.1cu.4154 Command Injection vuldb.com · Third-Party Advisory https://vuldb.com/?submit.740767
- VDB-343382 | Totolink A7000R cstecgi.cgi setUpgradeFW command injection vuldb.com · Technical Description https://vuldb.com/?id.343382
- Product — totolink.net totolink.net · Product https://www.totolink.net/
Show 1 more reference
- VDB-343382 | CTI Indicators (IOB, IOC, TTP, IOA) vuldb.com · Signature https://vuldb.com/?ctiid.343382
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| KEVIntel First | 2026-07-30 05:53 UTC |
Operational indicators for this CVE are listed on the Detection tab.
Observed Exploitation Attempts
Exploitation attempts against this vulnerability observed first-hand by KEVIntel private honeypots over the last 30 days.
- Attempts Observed
- 1
- Unique Attacker IPs
- 1
- Attacker Countries
- 🇳🇱
- Sensors Observed
- 1
Exploitation Attempts Over the Last 7 Days
First observed (all time) 2026-07-30 00:27 UTC · Last observed 2026-07-30 00:27 UTC
See more exploitation detail
- Pro — sensor software/region breakdown and 24h/7d window summaries.
- Enterprise — raw attacker IPs, request paths, User-Agents, and payloads.
Indicators of Compromise (IoCs)
Attacker IP IoCs observed in KEVIntel sensors are available to Pro and Enterprise accounts on the Detection tab and through the Pro API.
Learn about Pro API accessObserved Detection Signals (30d)
Aggregate counts from KEVIntel sensor telemetry for this CVE.
- Distinct request paths
- 1
- Distinct User-Agents
- 1
The specific request paths and User-Agents attackers are using are available on Pro and Enterprise plans.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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:P
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
AV:N/AC:L/Au:S/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2026-07-30 00:27:43 UTC · KEVIntel
Active exploitation observed
Recorded 2026-07-30 00:27:43 UTC · KEVIntel sensor
Proof of concept available
Recorded 2026-01-16 07:53:00 UTC
Weaknesses (CWE)
-
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
-
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
public · Created 2026-01-16 07:53:00 UTC
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:27 UTC about 11 hours ago00:27 UTC · about 11 hours ago
Observed by KEVIntel sensors
Evidence-backed exploitation signal
-
00:27 UTC about 11 hours ago00:27 UTC · about 11 hours ago
Indicator of compromise added
Indicators of compromise recorded
-
20:32 UTC 6 months ago20:32 UTC · 6 months ago
CVE published
Vulnerability disclosed publicly
-
14:39 UTC 6 months ago14:39 UTC · 6 months ago
CVE ID reserved
Identifier reserved by the CNA
-
07:53 UTC 7 months ago07:53 UTC · 7 months ago
Public PoC available
Public proof-of-concept code published
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-1623
{
"cve_id": "CVE-2026-1623",
"title": "Totolink A7000R cstecgi.cgi setUpgradeFW command injection",
"affected_vendor": "Totolink",
"affected_product": "A7000R",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 5.3,
"epss_score": 0.0218,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": true
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}