7.4

CVE-2018-8020: apache software foundation apache tomcat native Improper Certificate Validation

Modified
AliasesUBUNTU-CVE-2018-8020DEBIAN-CVE-2018-8020
Published 31-07-2018Last modified 17-09-2024

Vulnerability summary

CVE-2018-8020 is a high (CVSS 7.4) Improper Certificate Validation vulnerability in apache software foundation apache tomcat native. EPSS estimates a 4.18% chance of exploitation in the next 30 days, higher than 90.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.4 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.4/10
010
High · v3.0 (NVD)
EPSS score
4.18%
0%100%
Low · -0.02 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 4 · Related 1
DLA-1475-1MGASA-2019-0184RHSA-2018:2469SUSE-SU-2019:14014-1

Timeline

  1. 31-07-2018
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

Apache Tomcat Native 1.2.0 to 1.2.16 and 1.1.23 to 1.1.34 has a flaw that does not properly check OCSP pre-produced responses, which are lists (multiple entries) of certificate statuses. Subsequently, revoked client certificates may not be properly identified, allowing for users to authenticate with revoked certificates to connections that require mutual TLS. Users not using OCSP checks are not affected by this vulnerability.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

4.18%

Chance of exploitation in the next 30 days

Percentile

91%

Versus all other CVEs

30-day change

Decrease -0.02 pp

From 4.20% 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.

Debian2 products
Apache1 product
Apache software foundation1 product
Ubuntu1 product
  • tomcat-nativeAll versions (No fix recorded)

4 vendors · 5 products

References

18 links
Show all 18 references