CRITICAL
Caddy before 0.10.13 mishandles TLS client authentication, as demonstrated by an authentication bypass caused by the lack of the StrictHostMatching mode
Published Jun 15, 2020
9.8
CRITICALCVSS 3.1
EPSS 2.72%
Description
Caddy before 0.10.13 mishandles TLS client authentication, as demonstrated by an authentication bypass caused by the lack of the StrictHostMatching mode.
Affected products
No data.
- < 0.10.3
No data.
No Red Hat product state for this CVE.
github.com/caddyserver/caddy
Go
Introduced 0 Fixed 0.10.13github.com/mholt/caddy
Go
Introduced 0 Fixed 0.10.13
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/caddyserver/caddy | 0 | 0.10.13 |
| Go | github.com/mholt/caddy | 0 | 0.10.13 |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.72% 0.02723
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02723
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.72% (0.02723) | 85.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.72% (0.02723) | 84.07th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.67% (0.00669) | 68.95th | v4 (v2025.03.14) |
| Mar 29, 2025 | 37.94% (0.37942) | 95.77th | v4 (v2025.03.14) |
| Mar 24, 2025 | 0.67% (0.00669) | 68.95th | v4 (v2025.03.14) |
| Mar 23, 2025 | 6.92% (0.06921) | 89.86th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.33% (0.00328) | 71.24th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.33% (0.00328) | 70.14th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.33% (0.00328) | 66.28th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.62% (0.00624) | 17.80th | v1 |
| Jan 6, 2022 | 0.62% (0.00624) | 17.24th | v1 |
| Sep 1, 2021 | 0.62% (0.00624) | 45.04th | v1 |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
Weaknesses (1)
References (7)
- https://bugs.gentoo.org/715214 x_refsource_MISCThird Party Advisory
- https://github.com/advisories/GHSA-gr7w-x2jp-3xgw Advisory
- https://github.com/caddyserver/caddy/commit/4d9ee000c8d2cbcdd8284007c1e0f2da7bc3c7c3
- https://github.com/caddyserver/caddy/pull/2099
- https://github.com/caddyserver/caddy/releases/tag/v0.10.13 x_refsource_MISCRelease NotesThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-21246
- https://pkg.go.dev/vuln/GO-2020-0043
| Link | Providers | Tags |
|---|---|---|
| https://bugs.gentoo.org/715214 | x_refsource_MISCThird Party Advisory | |
| https://github.com/advisories/GHSA-gr7w-x2jp-3xgw | Advisory | |
| https://github.com/caddyserver/caddy/commit/4d9ee000c8d2cbcdd8284007c1e0f2da7bc3c7c3 | ||
| https://github.com/caddyserver/caddy/pull/2099 | ||
| https://github.com/caddyserver/caddy/releases/tag/v0.10.13 | x_refsource_MISCRelease NotesThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-21246 | ||
| https://pkg.go.dev/vuln/GO-2020-0043 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jun 15, 2020
Updated Aug 5, 2024
Reserved Jun 15, 2020
Link CVE-2018-21246
CISA Vulnrichment
GHSA-GR7W-X2JP-3XGW Updated n/a