# CVE-2026-38711: Cudy TR and WR Series Routers command injection in system.upgrade_check

Source: https://junglewise.ai/threats/cve-2026-38711-cudy-tr-and-wr-series-routers-command-injection-in-system-upgrade  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-31. Updated: 2026-07-31  
License: CC BY 4.0 with a link back

CVE-2026-38711 · Severity: info · CVSS 9.8 · Published 2026-07-31

A security vulnerability has been identified in several Cudy router models, which are devices used to provide internet connectivity and manage home or office networks. An attacker could exploit this flaw to take complete control of the router, potentially allowing them to monitor internet traffic, redirect users to malicious websites, or disable the network entirely. This issue is particularly serious because it allows the attacker to gain the highest level of administrative access (root) on the device.

Technologies: [Cudy TR1200](https://junglewise.ai/threats/technologies/tr1200), [Cudy TR3000](https://junglewise.ai/threats/technologies/tr3000), [Cudy WR1200](https://junglewise.ai/threats/technologies/wr1200), [Cudy WR1300](https://junglewise.ai/threats/technologies/wr1300), [Cudy WR1500](https://junglewise.ai/threats/technologies/wr1500), [Cudy WR300](https://junglewise.ai/threats/technologies/wr300), [Cudy WR3000](https://junglewise.ai/threats/technologies/wr3000), [Cudy WR3600](https://junglewise.ai/threats/technologies/wr3600), [Cudy WR6500](https://junglewise.ai/threats/technologies/wr6500). Vendors: [Cudy](https://junglewise.ai/threats/vendors/cudy).

## Quick answers

**Is CVE-2026-38711 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-38711 being exploited in the wild.

**How severe is CVE-2026-38711?** Informational severity, with a CVSS score of 9.8, published 31 July 2026.

**Which products and versions are affected?** Cudy TR1200 v2.4.15; Cudy TR3000 v2.4.21; Cudy WR1200 v2.4.23; Cudy WR1300 v2.4.22; and 5 more.

**Is there a fix for CVE-2026-38711?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-38711 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-38711?** Check whether you run Cudy TR1200, Cudy TR3000, Cudy WR1200 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A command injection vulnerability exists in the 'system.upgrade_check' interface of multiple Cudy router models (TR and WR series). The flaw is caused by insufficient sanitization of user-supplied input passed to system-level commands during the upgrade check process. An unauthenticated remote attacker can exploit this by sending a specially crafted request to the vulnerable interface. Successful exploitation allows the attacker to execute arbitrary shell commands with root privileges, leading to full system compromise. The vulnerability affects various firmware versions including TR1200 v2.4.15 and WR3000 v2.4.19.

## Affected products

- Cudy TR1200 v2.4.15
- Cudy TR3000 v2.4.21
- Cudy WR300 v2.4.25
- Cudy WR1200 v2.4.23
- Cudy WR1300 v2.4.22
- Cudy WR1500 v2.3.10
- Cudy WR3000 v2.4.19
- Cudy WR3600 v2.3.16
- Cudy WR6500 v2.3.15

## Timeline

- 2026-07-31: disclosed
- 2026-07-31: advisory

## References

- [https://www.cudy.com/pages/security-advisory/cudy-sa-26-7-7-kjw-1-b](https://www.cudy.com/pages/security-advisory/cudy-sa-26-7-7-kjw-1-b)

## Related threats

- [Cudy Routers command injection in ipsec_conn interface](https://junglewise.ai/threats/cve-2026-38713-cudy-routers-command-injection-in-ipsec-conn-interface)
- [Cudy TR1200 and TR3000 command injection in system.setclock](https://junglewise.ai/threats/cve-2026-38710-cudy-tr1200-and-tr3000-command-injection-in-system-setclock)
- [Cudy TR and WR Routers command injection in system.setclock](https://junglewise.ai/threats/cve-2026-38708-cudy-tr-and-wr-routers-command-injection-in-system-setclock)
- [Cudy Routers command injection in net.set_wan interface](https://junglewise.ai/threats/cve-2026-38709-cudy-routers-command-injection-in-net-set-wan-interface)