9.8

CVE-2018-16395: canonical ubuntu_linux

Modified
AliasesALPINE-CVE-2018-16395RHSA-2018:3738RHSA-2019:1948
Published 16-11-2018Last modified 05-08-2024

Vulnerability summary

CVE-2018-16395 is a critical (CVSS 9.8) vulnerability in canonical ubuntu_linux. EPSS estimates a 10.71% chance of exploitation in the next 30 days, higher than 95.8% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 11% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.0 (NVD)
EPSS score
10.71%
0%100%
Medium · 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 11 · Related 5
DLA-1558-1DSA-4332-1MGASA-2018-0411OPENSUSE-SU-2019:1771-1RHSA-2018:3729RHSA-2018:3730

Timeline

  1. 16-11-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in the OpenSSL library in Ruby before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.2, and 2.6.x before 2.6.0-preview3. When two OpenSSL::X509::Name objects are compared using ==, depending on the ordering, non-equal objects may return true. When the first argument is one character longer than the second, or the second argument contains a character that is one less than a character in the same position of the first argument, the result of == will be true. This could be leveraged to create an illegitimate certificate that may be accepted as legitimate and then used in signing or encryption operations.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

10.71%

Chance of exploitation in the next 30 days

Percentile

96%

Versus all other CVEs

30-day change

No change 0.00 pp

From 10.71% 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

No weakness data has been published for this record.

Affected systems

Version check

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

Redhat17 products
  • enterprise_linuxEOL7.4
  • ruby< 0:2.0.0.648-34.el7_6 | < 0:2.0.0.648-34.el7_4 | < 0:2.0.0.648-34.el7_5
  • ruby-debuginfo< 0:2.0.0.648-34.el7_6 | < 0:2.0.0.648-34.el7_4 | < 0:2.0.0.648-34.el7_5
  • ruby-devel< 0:2.0.0.648-34.el7_6 | < 0:2.0.0.648-34.el7_4 | < 0:2.0.0.648-34.el7_5
  • ruby-doc< 0:2.0.0.648-34.el7_6 | < 0:2.0.0.648-34.el7_4 | < 0:2.0.0.648-34.el7_5
Ubuntu4 products
  • ruby1.9.1< 1.9.3.484-2ubuntu1.13
  • ruby2.0< 2.0.0.484-1ubuntu2.11
  • ruby2.3< 2.3.1-2~16.04.11
  • ruby2.5< 2.5.1-1ubuntu1.1
Ruby-lang2 products
  • openssl< 2.1.2
  • rubyEOL≥ 2.3.0, ≤ 2.3.7 | ≥ 2.4.0, ≤ 2.4.4 | ≥ 2.5.0, ≤ 2.5.1 | 2.6.0:preview1 | 2.6.0:preview2
Alpine1 product
  • ruby≥ 2.3.0, < 2.5.2-r0 | ≥ 2.3.0, < 2.3.8-r0 | ≥ 2.3.0, < 2.4.5-r0
Canonical1 product
Debian1 product
RubyGems1 product
  • openssl< 2.0.9 | ≥ 2.1.0, < 2.1.2

7 vendors · 27 products

References

40 links
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