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CVE-2019-18222

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

4.7 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.34%Down 0.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 4.7

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.

Record
CVE-2019-18222
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
1.9 LowAV:L/AC:M/Au:N/C:P/I:N/A:N
Weakness
CWE-203
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2019-18222
Updated
2026-11-02
EUVDEUVD-2019-8022 No score

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.

Record
EUVD-2019-8022
Updated
2026-11-03
GitHub AdvisoriesGHSA-fpgh-hvp5-cqc2 4.7

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

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.

Record
GHSA-fpgh-hvp5-cqc2
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-200, CWE-203
Updated
2026-11-02
OSVALPINE-CVE-2019-18222 4.7

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.

Record
ALPINE-CVE-2019-18222
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSV 4.7

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.

Record
CVE-2019-18222
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVDEBIAN-CVE-2019-18222 4.7

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.

Record
DEBIAN-CVE-2019-18222
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVJLSEC-2025-199 4.7

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

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.

Record
JLSEC-2025-199
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
1.9 LowAV:L/AC:M/Au:N/C:P/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2019-18222 4.7

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.

Record
UBUNTU-CVE-2019-18222
CVSS 3.1
4.7 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVMGASA-2020-0053 No score

Updated mbedtls packages fix security vulnerabilities

This update from mbedTLS 2.16.2 to mbedTLS 2.16.4 fixes several security vulnerabilities, among which:

The deterministic ECDSA calculation reused the scheme's HMAC-DRBG to implement blinding. Because of this for the same key and message the same blinding value was generated. This reduced the effectiveness of the countermeasure and leaked information about the private key through side channels (CVE-2019-16910).

Fix side channel vulnerability in ECDSA. Our bignum implementation is not constant time/constant trace, so side channel attacks can retrieve the blinded value, factor it (as it is smaller than RSA keys and not guaranteed to have only large prime factors), and then, by brute force, recover the key (CVE-2019-18222).

See release notes for details.

Record
MGASA-2020-0053
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mbedtls
Alpine:v3.10
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.11
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.12
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.13
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.14
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.15
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.16
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.17
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.18
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.19
 before 2.16.4-r0
2.16.4-r0
Show 13 moreShow less
Affected packages
PackageAffectedFixed
mbedtls
Alpine:v3.20
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.21
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.22
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.23
 before 2.16.4-r0
2.16.4-r0
mbedtls
Alpine:v3.24
 before 2.16.4-r0
2.16.4-r0
mbedtls
Debian:12
 before 2.16.4-1
2.16.4-1
mbedtls
Debian:13
 before 2.16.4-1
2.16.4-1
mbedtls
Debian:14
 before 2.16.4-1
2.16.4-1
mbedtls
Debian:10
From an advisory covering 18 CVEs
 before 2.16.9-0~deb10u1, plus listed versions
2.16.0-12.16.2-12.16.3-12.16.4-12.16.5-1
2.16.9-0~deb10u1
MbedTLS_jll
Julia
 before 2.16.6+0
2.16.6+0
mbedtls
Mageia:7
From an advisory covering 2 CVEs
 before 2.16.4-1.mga7
2.16.4-1.mga7
mbedtls
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.1.2-12.2.0-12.2.1-12.2.1-22.2.1-2ubuntu0.12.2.1-2ubuntu0.22.2.1-2ubuntu0.3
 None known
mbedtls
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.5.1-1ubuntu12.6.0-12.7.0-22.8.0-12.8.0-1ubuntu0.1~esm1
 None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-18222 is a medium vulnerability (CVSS 4.7) in Arm Mbed Crypto, published January 23, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 27th percentile. Fixed in mbedtls 2.16.4-r0.

References

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