CVE-2019-17212

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 3.1%, top 14% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Buffer overflows were discovered in the CoAP library in Arm Mbed OS 5.14.0. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses CoAP input linearly using a while loop. Once an option is parsed in a loop, the current point (*packet_data_pptr) is increased correspondingly. The pointer is restricted by the size of the received buffer, as well as by the 0xFF delimiter byte. Inside each while loop, the check of the value of *packet_data_pptr is not strictly enforced. More specifically, inside a loop, *packet_data_pptr could be increased and then dereferenced without checking. Moreover, there are many other functions in the format of sn_coap_parser_****() that do not check whether the pointer is within the bounds of the allocated buffer. All of these lead to heap-based or stack-based buffer overflows, depending on how the CoAP packet buffer is allocated.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
86.2%
KEV
Not listed

Published

November 5, 2019

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Jun 22, 2026
No patch confirmed yet.
generic

mbed-os/features/frameworks/mbed-coap/source/sn_coap_parser.c at d91ed5fa42ea0f32e4422a3c562e7b045a17da40 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/blob/d91ed5fa42ea0f32e4422a3c562e7b045a17da40/features/frameworks/mbed-coap/source/sn_coap_parser.c#L310
generic

mbed-os/features/frameworks/mbed-coap/source/sn_coap_parser.c at d91ed5fa42ea0f32e4422a3c562e7b045a17da40 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/blob/d91ed5fa42ea0f32e4422a3c562e7b045a17da40/features/frameworks/mbed-coap/source/sn_coap_parser.c#L301
generic

mbed-os/features/frameworks/mbed-coap/source/sn_coap_parser.c at d91ed5fa42ea0f32e4422a3c562e7b045a17da40 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/blob/d91ed5fa42ea0f32e4422a3c562e7b045a17da40/features/frameworks/mbed-coap/source/sn_coap_parser.c#L257
generic

memory acess out of range in MbedOS CoAP library parser part · Issue #11803 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/issues/11803
generic

mbed-os/features/frameworks/mbed-coap/source/sn_coap_parser.c at d91ed5fa42ea0f32e4422a3c562e7b045a17da40 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/blob/d91ed5fa42ea0f32e4422a3c562e7b045a17da40/features/frameworks/mbed-coap/source/sn_coap_parser.c#L660
generic

mbed-os/features/frameworks/mbed-coap/source/sn_coap_parser.c at d91ed5fa42ea0f32e4422a3c562e7b045a17da40 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/blob/d91ed5fa42ea0f32e4422a3c562e7b045a17da40/features/frameworks/mbed-coap/source/sn_coap_parser.c#L331
generic

mbed-os/features/frameworks/mbed-coap/source/sn_coap_parser.c at d91ed5fa42ea0f32e4422a3c562e7b045a17da40 · ARMmbed/mbed-os · GitHub

https://github.com/ARMmbed/mbed-os/blob/d91ed5fa42ea0f32e4422a3c562e7b045a17da40/features/frameworks/mbed-coap/source/sn_coap_parser.c#L313

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:21 UTCEG score recompute
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2019-17212?
CVE-2019-17212 is a critical vulnerability published on November 5, 2019. Buffer overflows were discovered in the CoAP library in Arm Mbed OS 5.14.0. The CoAP parser is responsible for parsing received CoAP packets. The function sncoapparseroptionsparse() parses CoAP input linearly using a while loop. Once an option is parsed in a loop, the current point…
When was CVE-2019-17212 disclosed?
CVE-2019-17212 was first published in the National Vulnerability Database on November 5, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-17212 actively exploited?
CVE-2019-17212 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-17212?
CVE-2019-17212 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-17212?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-17212, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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