9.8

CVE-2018-21246: caddyserver caddy Improper Authentication

CVSS: 9.8v3.1CriticalModified
AliasesGHSA-gr7w-x2jp-3xgwGO-2020-0043
Published 15-06-2020Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-21246 is a critical (CVSS 9.8) Improper Authentication vulnerability in caddyserver caddy. EPSS estimates a 2.72% chance of exploitation in the next 30 days, higher than 85.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
2.72%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-06-2020
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

Caddy before 0.10.13 mishandles TLS client authentication, as demonstrated by an authentication bypass caused by the lack of the StrictHostMatching mode.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.72%

Chance of exploitation in the next 30 days

Percentile

86%

Versus all other CVEs

30-day change

0.00 pp

From 2.72% on 20-09-2026

20-09-202620-10-2026
EPSS score
2.72%

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

Caddyserver1 product
Github.com/caddyserver1 product
  • caddy< 0.10.13
Github.com/mholt1 product
  • caddy< 0.10.13

3 vendors · 3 products

References

7 links