CVE-2025-11617
Bulletin ID: AWS-2025-023 Scope: AWS Content Type: Important (requires attention) Publication Date: 2025/10/10 10:15 PM PDT We identified the following CVEs: CVE-2025-11616 - A Buffer Over-read when receiving ICMPv6 packets of certain message types which are smaller than the expected size. CVE-2025-11617 - A Buffer Over-read when receiving a IPv6 packet with incorrect payload lengths in the packet header. CVE-2025-11618 - An invalid pointer dereference when receiving a UDP/IPv6 packet with an incorrect IP version field in the packet header. Description: FreeRTOS-Plus-TCP is an open source TCP/IP stack implementation specifically designed for FreeRTOS. The stack provides a standard Berkeley sockets interface and supports essential networking protocols including IPv6, ARP, DHCP, DNS, LLMNR, mDNS, NBNS, RA, ND, ICMP, and ICMPv6. These issues only affect applications using IPv6. Affected versions: v4.0.0 to v4.3.3, if IPv6 support is enabled
CSIRTS triage
- What
- Buffer over-read issues when receiving improperly sized ICMPv6 packets.
- Who is affected
- Applications using IPv6 with FreeRTOS-Plus-TCP.
- Urgency
- Remediation is important to prevent potential crashes or unexpected behavior.
- Action
- Review and update the handling of ICMPv6 packets.
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Exploitation outlook
- Low exploitation risk0.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.
Advisory coverage (1)
- unknownBuffer Over-read when receiving improperly sized ICMPv6 packetsaws · 2026-06-05
External references
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