TI-2026-79276 Aliases CVE-2026-66281 GHSA-66pg-69wm-9qqf

Infinite loop in Silicon Labs EmberZNet Discover Attributes handling

LOW 27CWE-835Published 2026-10-22 · Updated 2026-10-23

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-835.

Summary

Silicon Labs EmberZNet through 9.1.1 has a loop with an unreachable exit condition (CWE-835). A malformed Discover Attributes command sends the device into an infinite loop, which makes it unavailable. A network-reachable attacker who has already joined the network with low privileges can trigger this, and only devices supporting manufacturer-specific clusters are impacted.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

In EmberZNet 9.1.1 and earlier, a malformed Discover Attributes command can result in a loop with unreachable exit condition (infinite loop). These messages must come from a device that has already joined the network. Only devices supporting manufacturer-specific clusters are impacted.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00331 26th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
silabs.com	EmberZNet	up to 9.1.1	—	No fix listed	CNA

EmberZNet Vendorsilabs.com Affected up to 9.1.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:silabs:emberznet::::::::	up to 9.1.1	Vulnerable	silabs.com

cpe:2.3:a:silabs:emberznet:*:*:*:*:*:*:*:* Versions up to 9.1.1 Vulnerable ·silabs.com

Remediation

The sources list no fixed version for EmberZNet.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-10-22
Silicon Labs EmberZNet — github.com/SiliconLabsSoftware/docs-security-advisories/blo…
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-79281 Out-of-bounds write in EmberZNet GetGroupMembership handlingPriority LOW 27
- TI-2026-79277 Uncontrolled recursion in EmberZNet Publish Billing Period handlingPriority LOW 27
Show all 3 records → Advisory →

Timeline

2026-10-22 Threatist record created from CVE-2026-66281
2026-10-22 Alias added: GHSA-66pg-69wm-9qqf
2026-10-23 CISA SSVC decision points changed
2026-10-23 Priority changed: MEDIUM → LOW
2026-10-29 CVSS score added · NVD

References

Patch 1

https://github.com/SiliconLabsSoftware/docs-security-advisories/blob/main/Advisories/500-599/A-00000590.md

TI-2023-21716 Touchlink authentication bypass due to packets processed after timeout or out of range in Ember ZNet CVSS 3.1CRITICAL 10.0
TI-2022-08741 Malformed Zigbee packet causes Assert in EmberZNet 7.0.0 or earlier CVSS 3.1CRITICAL 9.8
TI-2023-28047 Silicon Labs EFR32xxx parts with classic key storage do not use hardware accelerated AES-CCM CVSS 3.1CRITICAL 9.8
TI-2022-08742 Malformed Zigbee packet causes Assert in EmberZNet 7.0.1 or earlier CVSS 3.1HIGH 7.5
TI-2023-28049 Potential DoS for EFR32xxx parts in high traffic environments due to null buffer dereference / crash CVSS 3.1HIGH 7.5
TI-2023-28048 Potential DoS due to BusFault and Assert in Ember ZNet legacy packet buffer CVSS 3.1HIGH 7.5

See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences