4.3

CVE-2020-12397: canonical ubuntu_linux Origin Validation Error

CVSS: 4.3v3.1MediumModified
AliasesUBUNTU-CVE-2020-12397DEBIAN-CVE-2020-12397
Published 22-05-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-12397 is a medium (CVSS 4.3) Origin Validation Error vulnerability in canonical ubuntu_linux. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.3% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.61%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 4
DLA-2206-1DSA-4683-1MGASA-2020-0209OPENSUSE-SU-2020:0643-1OPENSUSE-SU-2024:10601-1RHSA-2020:2046

Timeline

  1. 22-05-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird < 68.8.0.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

+0.01 pp

From 0.60% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.61%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Canonical1 product
Debian1 product
  • thunderbird< 1:68.8.0-1
Mozilla1 product
Ubuntu1 product
  • thunderbird< 1:68.8.0+build2-0ubuntu0.16.04.2 | < 1:68.8.0+build2-0ubuntu0.18.04.2 | < 1:68.8.0+build2-0ubuntu0.20.04.2

4 vendors · 4 products

References

9 links