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CVE-2019-16910

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled,...

5.3 MediumFix available

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

1.76%Up 0.3 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.3

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
CVE-2019-16910
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS 2.0
2.6 LowAV:N/AC:H/Au:N/C:P/I:N/A:N
Updated
2026-11-02
CVE List No score

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
CVE-2019-16910
Updated
2026-11-02
EUVDEUVD-2019-7407 No score

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
EUVD-2019-7407
Updated
2026-11-03
GitHub AdvisoriesGHSA-jg4p-c829-4q39 5.3

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled,...

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
GHSA-jg4p-c829-4q39
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness
CWE-200
Updated
2026-11-02
OSVALPINE-CVE-2019-16910 5.3

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
ALPINE-CVE-2019-16910
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated
2026-11-03
OSV 5.3

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
CVE-2019-16910
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVDEBIAN-CVE-2019-16910 5.3

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
DEBIAN-CVE-2019-16910
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVJLSEC-2025-198 5.3

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled,...

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
JLSEC-2025-198
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS 2.0
2.6 LowAV:N/AC:H/Au:N/C:P/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2019-16910 5.3

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Record
UBUNTU-CVE-2019-16910
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/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 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.11
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.12
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.13
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.14
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.15
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.16
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.17
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.18
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.19
 before 2.16.3-r0
2.16.3-r0
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Affected packages
PackageAffectedFixed
mbedtls
Alpine:v3.20
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.21
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.22
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.23
 before 2.16.3-r0
2.16.3-r0
mbedtls
Alpine:v3.24
 before 2.16.3-r0
2.16.3-r0
mbedtls2
Alpine:v3.20
 before 2.16.3-r0
2.16.3-r0
mbedtls2
Alpine:v3.21
 before 2.16.3-r0
2.16.3-r0
mbedtls2
Alpine:v3.22
 before 2.16.3-r0
2.16.3-r0
mbedtls2
Alpine:v3.23
 before 2.16.3-r0
2.16.3-r0
mbedtls2
Alpine:v3.24
 before 2.16.3-r0
2.16.3-r0
mbedtls3
Alpine:v3.24
 before 2.16.3-r0
2.16.3-r0
mbedtls
Debian:12
 before 2.16.3-1
2.16.3-1
mbedtls
Debian:13
 before 2.16.3-1
2.16.3-1
mbedtls
Debian:14
 before 2.16.3-1
2.16.3-1
mbedtls
Debian:10
 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
 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
affectedOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2019-16910 is a medium vulnerability (CVSS 5.3) in Arm Mbed Crypto, published September 26, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.76%, the 78th percentile. Fixed in mbedtls 2.16.3-r0.

References

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