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.
Metrics
Affected Vendors & Products
References
History
Thu, 30 Apr 2026 08:30:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Amazon
Amazon freertos-plus-tcp |
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| Vendors & Products |
Amazon
Amazon freertos-plus-tcp |
Wed, 29 Apr 2026 19:15:00 +0000
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| Metrics |
ssvc
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Wed, 29 Apr 2026 19:00:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP | |
| Weaknesses | CWE-191 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: AMZN
Published:
Updated: 2026-04-29T19:08:11.602Z
Reserved: 2026-04-29T14:27:49.474Z
Link: CVE-2026-7423
Updated: 2026-04-29T19:08:07.142Z
Status : Awaiting Analysis
Published: 2026-04-29T19:16:26.617
Modified: 2026-04-30T15:13:14.230
Link: CVE-2026-7423
No data.