The ECDSA signature implementation in ecdsa.c in Arm Mbed Crypto 2.1 and Mbed TLS through 2.19.1...

published 2020-01-23 6y ago modified 2026-07-23 3mo ago also EUVD-2019-8022 , JLSEC-2025-199

cvss: 4.7; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

The ECDSA signature implementation in ecdsa.c in Arm Mbed Crypto 2.1 and Mbed TLS through 2.19.1 does not reduce the blinded scalar before computing the inverse, which allows a local attacker to recover the private key via side-channel attacks.

Patch / fix

fixed in 3 distros 3

julia MbedTLS_jll 2.16.6+0
arm mbed_crypto 3.0.0
arm mbed_tls 2.7.13, 2.16.4, 2.20.0

debian alpine arch linux

mbedtls Debian 14, Debian 13, Debian 12 2.16.4-1

debian advisories DEBIAN-CVE-2019-18222

mbedtls Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 2.16.4-r0
mbedtls2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2.16.4-r0
mbedtls3 Alpine 3.24 2.16.4-r0

alpine advisories ALPINE-CVE-2019-18222

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

mbedtls Arch Linux 2.16.5-1

arch linux advisories AVG-1104

Is CVE-2019-18222 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.7	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	1.9	AV:L/AC:M/Au:N/C:P/I:N/A:N
OSV	3.1	4.7	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
julia	MbedTLS_jll	<2.16.6+0	2.16.6+0

Classification

Weakness

CWE-203 Observable Discrepancy

References

lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/NGDACU65MYZXXVPQP2EBHUJGOR4RWLVY/
vendor-advisory, mailing-list, third-party-advisory, web
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/A3GWQNONS7GRORXZJ7MOJFUEJ2ZJ4OUW/
vendor-advisory, mailing-list, third-party-advisory, web
tls.mbed.org /tech-updates/security-advisories
vendor-advisory, web
tls.mbed.org /tech-updates/security-advisories/mbedtls-security-advisory-2019-12
vendor-advisory, web
lists.debian.org /debian-lts-announce/2022/12/msg00036.html
mailing-list, third-party-advisory, web

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.