What is the CVSS score of CVE-2020-12402?

CVE-2020-12402 has a CVSS 3.1 base score of 4.4 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.3%.

Firefox CVE-2020-12402

MEDIUM

Observable Discrepancy (CWE-203)

2020-07-09 security@mozilla.org

Mozilla Information Disclosure Firefox Fedora Leap Debian Linux

4.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.4 MEDIUM

AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

CVE Published

Jul 09, 2020 - 15:15 nvd

MEDIUM 4.4

DescriptionNVD

During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78.

AnalysisAI

During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. Rated medium severity (CVSS 4.4). No vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-203. During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78. Affected products include: Mozilla Firefox, Fedoraproject Fedora, Opensuse Leap, Debian Debian Linux.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.