HIGH
mod_md, DoS via Coredumps on specially crafted requests
Published Jul 18, 2018
7.5
HIGHCVSS 3.0
EPSS 55.61%
Description
By specially crafting HTTP requests, the mod_md challenge handler would dereference a NULL pointer and cause the child process to segfault. This could be used to DoS the server. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33).
Affected products
-
- Version Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33)StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | n/a |
|
Configuration 1
- 2.4.33
Configuration 2
- n/a
No data.
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat Enterprise Linux 7
httpd
Not affected
Red Hat Enterprise Linux 8
httpd
Not affected
Red Hat JBoss Core Services
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 5
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 6
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd
Not affected
Red Hat JBoss Web Server 3
httpd
Not affected
Red Hat Mobile Application Platform 4
httpd
Not affected
Red Hat Software Collections
httpd24-httpd
Not affected
Red Hat Virtualization 4
httpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 7 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 8 | httpd | Not affected | n/a |
| Red Hat JBoss Core Services | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd | Not affected | n/a |
| Red Hat JBoss Web Server 3 | httpd | Not affected | n/a |
| Red Hat Mobile Application Platform 4 | httpd | Not affected | n/a |
| Red Hat Software Collections | httpd24-httpd | Not affected | n/a |
| Red Hat Virtualization 4 | httpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
1 other source (Red Hat) ▾
5.3 MEDIUM Red Hat
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
55.61% 0.55608
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.55608
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 (47 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 55.61% (0.55608) | 99.01th | v5 (v2026.06.15) |
| Sep 22, 2026 | 55.61% (0.55608) | 98.99th | v5 (v2026.06.15) |
| Sep 21, 2026 | 76.65% (0.76646) | 99.53th | v5 (v2026.06.15) |
| Sep 6, 2026 | 56.04% (0.56037) | 98.98th | v5 (v2026.06.15) |
| Sep 5, 2026 | 76.65% (0.76646) | 99.52th | v5 (v2026.06.15) |
| Aug 30, 2026 | 56.04% (0.56037) | 98.97th | v5 (v2026.06.15) |
| Aug 28, 2026 | 76.65% (0.76646) | 99.52th | v5 (v2026.06.15) |
| Aug 24, 2026 | 56.04% (0.56037) | 98.97th | v5 (v2026.06.15) |
| Aug 23, 2026 | 76.65% (0.76646) | 99.52th | v5 (v2026.06.15) |
| Jul 31, 2026 | 55.76% (0.55761) | 98.94th | v5 (v2026.06.15) |
| Jun 15, 2026 | 51.71% (0.51714) | 98.80th | v5 (v2026.06.15) |
| May 27, 2026 | 77.68% (0.77676) | 99.01th | v4 (v2025.03.14) |
| Jan 31, 2026 | 81.52% (0.81522) | 99.14th | v4 (v2025.03.14) |
| Jan 18, 2026 | 79.91% (0.79907) | 99.06th | v4 (v2025.03.14) |
| Jan 7, 2026 | 54.63% (0.54627) | 97.94th | v4 (v2025.03.14) |
| Jan 6, 2026 | 46.35% (0.46349) | 97.54th | v4 (v2025.03.14) |
| Jan 1, 2026 | 48.81% (0.48815) | 97.67th | v4 (v2025.03.14) |
| Dec 28, 2025 | 45.76% (0.45757) | 97.49th | v4 (v2025.03.14) |
| Dec 27, 2025 | 47.85% (0.47850) | 97.62th | v4 (v2025.03.14) |
| Nov 21, 2025 | 45.76% (0.45757) | 97.47th | v4 (v2025.03.14) |
| Nov 18, 2025 | 63.24% (0.63243) | 98.38th | v4 (v2025.03.14) |
| Oct 28, 2025 | 40.02% (0.40024) | 97.14th | v4 (v2025.03.14) |
| Oct 27, 2025 | 42.11% (0.42108) | 97.29th | v4 (v2025.03.14) |
| Oct 11, 2025 | 40.02% (0.40024) | 97.14th | v4 (v2025.03.14) |
| Jul 30, 2025 | 38.15% (0.38150) | 97.08th | v4 (v2025.03.14) |
| Mar 30, 2025 | 39.73% (0.39729) | 97.02th | v4 (v2025.03.14) |
| Mar 29, 2025 | 33.38% (0.33379) | 95.20th | v4 (v2025.03.14) |
| Mar 17, 2025 | 39.73% (0.39729) | 96.98th | v4 (v2025.03.14) |
| Feb 18, 2025 | 57.06% (0.57062) | 97.89th | v3 (v2023.03.01) |
| Jan 11, 2025 | 49.98% (0.49981) | 97.63th | v3 (v2023.03.01) |
| Dec 17, 2024 | 57.55% (0.57552) | 97.84th | v3 (v2023.03.01) |
| May 1, 2024 | 94.89% (0.94894) | 99.27th | v3 (v2023.03.01) |
| Apr 1, 2024 | 95.51% (0.95506) | 99.34th | v3 (v2023.03.01) |
| Mar 5, 2024 | 95.92% (0.95922) | 99.41th | v3 (v2023.03.01) |
| Jan 18, 2024 | 96.20% (0.96199) | 99.41th | v3 (v2023.03.01) |
| Dec 9, 2023 | 96.45% (0.96446) | 99.46th | v3 (v2023.03.01) |
| Jul 12, 2023 | 96.58% (0.96579) | 99.40th | v3 (v2023.03.01) |
| May 8, 2023 | 96.62% (0.96616) | 99.38th | v3 (v2023.03.01) |
| Mar 7, 2023 | 96.68% (0.96680) | 99.35th | v3 (v2023.03.01) |
| Mar 6, 2023 | 7.77% (0.07767) | 93.09th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.77% (0.07767) | 92.44th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.77% (0.07767) | 81.37th | v2 (v2022.01.01) |
| Feb 3, 2022 | 9.26% (0.09259) | 86.70th | v1 |
| Jan 6, 2022 | 9.26% (0.09259) | 86.55th | v1 |
| Sep 1, 2021 | 9.26% (0.09259) | 93.95th | v1 |
| Jun 8, 2021 | 9.26% (0.09259) | 0.00th | v1 |
| Apr 14, 2021 | 8.73% (0.08728) | 0.00th | v1 |
Weaknesses (1)
References (19)
- http://www.securitytracker.com/id/1041401 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-8011 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1605052 Issue Tracking
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-8011 x_refsource_CONFIRMVendor Advisory
- https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r03ee478b3dda3e381fd6189366fa7af97c980d2f602846eef935277d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbcd800074c84a538%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/re473305a65b4db888e3556e4dae10c2a04ee89dcff2e26ecdbd860a9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2018-8011
- https://security.netapp.com/advisory/ntap-20180926-0007/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-8011
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Jul 18, 2018
Updated Sep 16, 2024
Reserved Mar 9, 2018
Link CVE-2018-8011
CISA Vulnrichment
Updated n/a