5.3

CVE-2018-18509: mozilla thunderbird

Modified
AliasesUBUNTU-CVE-2018-18509DEBIAN-CVE-2018-18509
Published 26-04-2019Last modified 05-08-2024

Vulnerability summary

CVE-2018-18509 is a medium (CVSS 5.3) vulnerability in mozilla thunderbird. EPSS estimates a 1.68% chance of exploitation in the next 30 days, higher than 76.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.3/10
010
Medium · v3.0 (NVD)
EPSS score
1.68%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 6
DLA-1678-1DSA-4392-1MGASA-2019-0088OPENSUSE-SU-2019:0249-1OPENSUSE-SU-2019:1162-1OPENSUSE-SU-2024:10601-1

Timeline

  1. 26-04-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.68%

Chance of exploitation in the next 30 days

Percentile

77%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.68% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • thunderbird< 1:60.5.1-1
Mozilla1 product
Ubuntu1 product
  • thunderbird< 1:60.5.1+build2-0ubuntu0.14.04.1 | < 1:60.5.1+build2-0ubuntu0.16.04.1 | < 1:60.5.1+build2-0ubuntu0.18.04.1

3 vendors · 3 products

References

14 links
Show all 14 references