VIR Vulnerability Intelligence Relay

CVE-2026-7423

medium
Published 2026-04-29 · Modified 2026-05-04
CVSS v3
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v2
—
VIR risk
6.5

Description

Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB. To mitigate this issue, users should upgrade to the fixed version when available.

Predictions

Exploit likelihood
65%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://aws.amazon.com/security/security-bulletins/2026-021-aws/

Application impact
VendorProductVersionsFixed
aws amazonfreertos-plus-tcp{"startIncluding":"4.0.0","endExcluding":"4.2.6"}4.2.6

References

CWEs

CWE-191

Verify integrity in audit chain (admin only). AS-IS.