10

CVE-2018-18505: canonical ubuntu_linux Improper Authentication

Modified
AliasesUBUNTU-CVE-2018-18505DEBIAN-CVE-2018-18505ALPINE-CVE-2018-18505
Published 05-02-2019Last modified 05-08-2024

Vulnerability summary

CVE-2018-18505 is a critical (CVSS 10.0) Improper Authentication vulnerability in canonical ubuntu_linux. EPSS estimates a 4.42% chance of exploitation in the next 30 days, higher than 91.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 10 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
10.0/10
010
Critical · v3.0 (NVD)
EPSS score
4.42%
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 21 · Related 11
DLA-1648-1DLA-1678-1DSA-4376-1DSA-4392-1MGASA-2019-0060MGASA-2019-0069

Timeline

  1. 05-02-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

An earlier fix for an Inter-process Communication (IPC) vulnerability, CVE-2011-3079, added authentication to communication between IPC endpoints and server parents during IPC process creation. This authentication is insufficient for channels created after the IPC process is started, leading to the authentication not being correctly applied to later channels. This could allow for a sandbox escape through IPC channels due to lack of message validation in the listener process. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

4.42%

Chance of exploitation in the next 30 days

Percentile

91%

Versus all other CVEs

30-day change

No change 0.00 pp

From 4.42% 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.

Redhat6 products
Ubuntu4 products
  • firefox< 65.0+build2-0ubuntu0.14.04.1 | < 65.0+build2-0ubuntu0.16.04.1 | < 65.0+build2-0ubuntu0.18.04.1
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • 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
Debian3 products
  • firefox-esr< 60.5.0esr-1
  • thunderbird< 1:60.5.0-1
  • debian_linuxEOL8.0 | 9.0
Mozilla3 products
Alpine1 product
  • firefox-esr< 60.5.0-r0
Canonical1 product

6 vendors · 18 products

References

26 links
Show all 26 references