# CVE-2026-55731: Loytec Multiple Products DoS via SNMP Agent CPU Exhaustion

Source: https://junglewise.ai/threats/cve-2026-55731-loytec-multiple-products-dos-via-snmp-agent-cpu-exhaustion  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-24. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-55731 · Severity: info · CVSS 6.6 · Published 2026-07-24

A vulnerability exists in the SNMP management component of several Loytec building automation and control devices. An unauthenticated attacker can remotely send a specially crafted network request to these devices, causing them to consume excessive processor resources. This results in a persistent denial of service, making the building management systems unresponsive and disrupting operations.

Technologies: [LOYTEC L-DALI](https://junglewise.ai/threats/technologies/l-dali), [LOYTEC L-GATE](https://junglewise.ai/threats/technologies/l-gate), [LOYTEC L-INX](https://junglewise.ai/threats/technologies/l-inx), [LOYTEC L-IOB](https://junglewise.ai/threats/technologies/l-iob), [LOYTEC L-PAD](https://junglewise.ai/threats/technologies/l-pad), [LOYTEC L-ROC](https://junglewise.ai/threats/technologies/l-roc), [LOYTEC L-VIS](https://junglewise.ai/threats/technologies/l-vis), [LOYTEC LIP-ME201C](https://junglewise.ai/threats/technologies/lip-me201c). Vendors: [LOYTEC](https://junglewise.ai/threats/vendors/loytec).

## Quick answers

**Is CVE-2026-55731 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55731 being exploited in the wild.

**How severe is CVE-2026-55731?** Informational severity, with a CVSS score of 6.6, published 24 July 2026.

**Which products and versions are affected?** LOYTEC L-DALI through 8.4.16; LOYTEC L-GATE through 8.4.16; LOYTEC L-INX through 8.4.16; LOYTEC L-IOB through 8.4.16; and 4 more.

**Is there a fix for CVE-2026-55731?** 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-2026-55731 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-55731?** Check whether you run LOYTEC L-DALI, LOYTEC L-GATE, LOYTEC L-INX 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 vulnerability classified as CWE-606 (Unchecked Input for Loop Condition) exists in the SNMP agent of Loytec firmware through version 8.4.16 on LINX-A64 platforms. The flaw is triggered by a crafted SNMP GETNEXT request containing a large OID component. Because the agent does not properly validate the input used in loop conditions, processing the request leads to CPU exhaustion. This allows a remote, unauthenticated attacker to cause a persistent denial of service. The issue is resolved in firmware version 8.4.18.

## Affected products

- Loytec LIP-ME201C through 8.4.16
- Loytec L-INX through 8.4.16
- Loytec L-GATE through 8.4.16
- Loytec L-ROC through 8.4.16
- Loytec L-IOB through 8.4.16
- Loytec L-DALI through 8.4.16
- Loytec L-VIS through 8.4.16
- Loytec L-PAD through 8.4.16

## Timeline

- 2026-07-24: advisory
- 2026-07-24: disclosed

## References

- [https://www.loytec.com/support/product-security/advisories/8531-dibt-cve-20260601-0003-unchecked-input-for-loop-condition-cwe-606-in-the-snmp-agent-medium](https://www.loytec.com/support/product-security/advisories/8531-dibt-cve-20260601-0003-unchecked-input-for-loop-condition-cwe-606-in-the-snmp-agent-medium)

## Related threats

- [Loytec BACnet devices out-of-bounds read in bacdt_datetime_to_tod](https://junglewise.ai/threats/cve-2026-55732-loytec-bacnet-devices-out-of-bounds-read-in-bacdt-datetime-to-tod)
- [Loytec Multiple Products stack overflow in ltsudo](https://junglewise.ai/threats/cve-2026-55728-loytec-multiple-products-stack-overflow-in-ltsudo)
- [Loytec Building Automation Devices Improper Authentication in PAM](https://junglewise.ai/threats/cve-2026-12504-loytec-building-automation-devices-improper-authentication-in-pam)
- [Loytec Multiple Products privilege escalation in ltsudo](https://junglewise.ai/threats/cve-2026-12502-loytec-multiple-products-privilege-escalation-in-ltsudo)
- [Loytec Multiple Products Stored XSS in OPC XML-DA Server Statistics](https://junglewise.ai/threats/cve-2026-12496-loytec-multiple-products-stored-xss-in-opc-xml-da-server)