CVE-2020-12399: debian debian_linux Observable Discrepancy
CVSS: 4.4v3.1MediumModified
AliasesUBUNTU-CVE-2020-12399USN-4397-2DEBIAN-CVE-2020-12399
Published 09-07-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-12399 is a medium (CVSS 4.4) Observable Discrepancy vulnerability in debian debian_linux. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 50.1% of scored vulnerabilities.
CVSS score
4.4/10
010
Medium · v3.1 (NVD)EPSS score
0.65%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 18 · Related 10Timeline
- 09-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 4.4Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated4.4MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated4.4MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
Low 1.2Preferred score · NVD (NIST)
AV:L/AC:H/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
0.65%
Chance of exploitation in the next 30 days
Percentile
50%
Versus all other CVEs
30-day change
0.00 pp
From 0.65% on 18-09-2026
18-09-202618-10-2026
EPSS score0.65%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian4 products
- firefox-esr< 68.9.0esr-1
- nss< 2:3.53-1
- thunderbird< 1:68.9.0-1
- debian_linuxEOL9.0
Mozilla3 products
- firefox≥ unspecified, < 77 | < 77.0
- firefox_esr≥ unspecified, < 68.9 | < 68.9.0
- thunderbird≥ unspecified, < 68.9.0 | < 68.9.0
Ubuntu3 products
- firefox< 77.0.1+build1-0ubuntu0.16.04.1 | < 77.0.1+build1-0ubuntu0.18.04.1 | < 77.0.1+build1-0ubuntu0.20.04.1
- nss< 2:3.28.4-0ubuntu0.16.04.11 | < 2:3.35-2ubuntu2.8 | < 2:3.49.1-1ubuntu1.1 | < 2:3.28.4-0ubuntu0.14.04.5+esm5
- thunderbird< 1:68.10.0+build1-0ubuntu0.16.04.1 | < 1:68.10.0+build1-0ubuntu0.18.04.1 | < 1:68.10.0+build1-0ubuntu0.20.04.1
3 vendors · 10 products
References
18 links- bugzilla.mozilla.org/show_bug.cgi?id=1631576X Refsource MISCIssue TrackingPermissions RequiredVendor Advisory
- lists.debian.org/debian-lts-announce/2020/09/msg00029.htmlMailing ListX Refsource MLISTThird Party Advisory