CVE-2019-17212: Buffer overflows were discovered in the CoAP library in Arm Mbed OS 5.14.0

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CRITICAL 9.8REMOTEMITIGATE

CVE-2019-17212 is a critical-severity flaw (CVSS 9.8) affecting mbed. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-129, CWE-787
Published	2019-11-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mbed

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-11-05 15:15 UTCPublished CVE record published
2026-06-17 02:23 UTCUpdated Record last modified

mbed mbed MITIGATE

Affected: 5.13.2 · 5.14.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.13.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-17212?

mbed: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-17212 being exploited?

CVE-2019-17212 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-17212 affect?

CVE-2019-17212 affects mbed. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2019-17212?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

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References

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