CRITICAL

CVE-2019-17211

CVSS v3

9.8

CRITICAL

EPSS Score

2.6 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2019-17211 yet.

Full record on NVD

Description

An integer overflow was discovered in the CoAP library in Arm Mbed OS 5.14.0. The function sn_coap_builder_calc_needed_packet_data_size_2() is used to calculate the required memory for the CoAP message from the sn_coap_hdr_s data structure. Both returned_byte_count and src_coap_msg_ptr->payload_len are of type uint16_t. When added together, the result returned_byte_count can wrap around the maximum uint16_t value. As a result, insufficient buffer space is allocated for the corresponding CoAP message.

Technical details

Published: 2019-11-05

Frequently asked questions

What is CVE-2019-17211?

Is CVE-2019-17211 actively exploited?

Active exploitation of CVE-2019-17211 has not been confirmed. Its EPSS score was 2.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-17211?

CVE-2019-17211 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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