httpd: Billion laughs attack regression
Published Jul 14, 2017
6.5
MEDIUMCVSS 3.0
EPSS 2.20%
Description
The mod_dontdothat component of the mod_dav_svn Apache module in Subversion as packaged in Red Hat Enterprise Linux 5.11 does not properly detect recursion during entity expansion, which allows remote authenticated users with access to the webdav repository to cause a denial of service (memory consumption and httpd crash). NOTE: Exists as a regression to CVE-2009-1955.
Affected products
No data.
- 5.11
No data.
Red Hat Directory Server 8
apr-util
Not affected
Red Hat Directory Server 8
httpd
Not affected
Red Hat Enterprise Linux 5
apr-util
Will not fix
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat Enterprise Linux 6
apr-util
Not affected
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat Enterprise Linux 7
apr-util
Not affected
Red Hat Enterprise Linux 7
httpd
Not affected
Red Hat Software Collections
httpd24-apr-util
Not affected
Red Hat Software Collections
httpd24-httpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Directory Server 8 | apr-util | Not affected | n/a |
| Red Hat Directory Server 8 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 5 | apr-util | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | apr-util | Not affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 7 | apr-util | Not affected | n/a |
| Red Hat Enterprise Linux 7 | httpd | Not affected | n/a |
| Red Hat Software Collections | httpd24-apr-util | Not affected | n/a |
| Red Hat Software Collections | httpd24-httpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
AV:N/AC:L/Au:S/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.20% (0.02199) | 81.86th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.16% (0.02157) | 79.74th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.28% (0.00277) | 49.05th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.12% (0.00121) | 48.05th | v3 (v2023.03.01) |
| May 24, 2023 | 0.12% (0.00121) | 45.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.11% (0.00115) | 43.55th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
References (5)
- http://www.securityfocus.com/bid/92320 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2016-6312 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1364122 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-6312
- https://www.cve.org/CVERecord?id=CVE-2016-6312
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/92320 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2016-6312 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1364122 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-6312 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-6312 |
Change history (0)
No recorded changes yet.