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Vulnerability details: VCID-54s7-rrtw-a7cg
Vulnerability ID VCID-54s7-rrtw-a7cg
Aliases CVE-2020-12402
Summary 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. We would like to thank Sohaib ul Hassan for contributing a fix for this issue as well.*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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-203 Observable Discrepancy
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
System Score Found at
cvssv3 4.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12402.json
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
epss 0.00025 https://api.first.org/data/v1/epss?cve=CVE-2020-12402
cvssv3.1 4.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 1.2 https://nvd.nist.gov/vuln/detail/CVE-2020-12402
cvssv3.1 4.4 https://nvd.nist.gov/vuln/detail/CVE-2020-12402
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-24
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-29
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12402.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12402
https://bugzilla.mozilla.org/show_bug.cgi?id=1631597
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17006
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17023
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12399
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12402
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/
https://security.gentoo.org/glsa/202007-10
https://www.debian.org/security/2020/dsa-4726
https://www.mozilla.org/security/advisories/mfsa2020-24/
1826231 https://bugzilla.redhat.com/show_bug.cgi?id=1826231
963152 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=963152
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
CVE-2020-12402 https://nvd.nist.gov/vuln/detail/CVE-2020-12402
mfsa2020-24 https://www.mozilla.org/en-US/security/advisories/mfsa2020-24
mfsa2020-29 https://www.mozilla.org/en-US/security/advisories/mfsa2020-29
RHSA-2020:3280 https://access.redhat.com/errata/RHSA-2020:3280
RHSA-2020:4076 https://access.redhat.com/errata/RHSA-2020:4076
RHSA-2021:0949 https://access.redhat.com/errata/RHSA-2021:0949
USN-4417-1 https://usn.ubuntu.com/4417-1/
USN-4417-2 https://usn.ubuntu.com/4417-2/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12402.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:L/AC:H/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12402
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12402
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.0535
EPSS Score 0.00025
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:44.321606+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-24.yml 37.0.0