CVE-2021-36160
HighA carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS).
Published Nov 25, 2021 · Updated Sep 8, 2026 · Also known as ALPINE-CVE-2021-36160, BIT-apache-2021-36160, DEBIAN-CVE-2021-36160, DLA-2768-1, UBUNTU-CVE-2021-36160
Key Facts
Patch immediately- CVE-2021-36160 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting HTTP Server (Apache), Cloud Backup (Netapp), Clustered Data Ontap (Netapp) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 63% probability of exploitation in the next 30 days.
- Fixed versions are available, including apache 2.4.49, apache 2.4.49-1, HTTP Server 2.4.49.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
63%
Higher than 99.1% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2021-36160 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS). This issue affects Apache HTTP Server versions 2.4.30 to 2.4.48 (inclusive).
Affected Products
215 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | 12.2.1.3.0, 12.2.1.4.0, >= Apache HTTP Server 2.4 | 2.4.49 |
| Cloud BackupNetapp | See advisory | n/a |
| Clustered Data OntapNetapp | See advisory | n/a |
| StoragegridNetapp | See advisory | n/a |
| Communications Cloud Native Core Network Function Cloud Native EnvironmentOracle | 1.10.0 | n/a |
Patched Releases
apache
2.4.49, 2.4.49-1
HTTP Server
2.4.49
apache2
2.4.29-1ubuntu4.17, 2.4.33-3.55.1, 2.4.38-3+deb10u6, 2.4.41-4ubuntu3.5, 2.4.43-3.32.1, 2.4.43-lp152.2.21.1, 2.4.49-1, 2.4.49-r0, 2.4.51-1~deb11u1
apache2-devel
2.4.33-3.55.1, 2.4.43-3.32.1, 2.4.43-lp152.2.21.1
apache2-doc
2.4.33-3.55.1, 2.4.43-3.32.1, 2.4.43-lp152.2.21.1
apache2-event
2.4.43-3.32.1, 2.4.43-lp152.2.21.1
apache2-example-pages
2.4.43-3.32.1, 2.4.43-lp152.2.21.1
apache2-prefork
2.4.33-3.55.1, 2.4.43-3.32.1, 2.4.43-lp152.2.21.1
apache2-utils
2.4.33-3.55.1, 2.4.43-3.32.1, 2.4.43-lp152.2.21.1
apache2-worker
2.4.33-3.55.1, 2.4.43-3.32.1, 2.4.43-lp152.2.21.1
httpd
2.4.37-47.0.1.module+el8.6.0+20649+083145da.1, 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma, 2.4.37-47.module+el8.6.0+823+f143cee1.1, 2.4.37-47.module+el8.6.0+985+b8ff6398.2, 2.4.48-3.ph1, 2.4.48-3.ph2, 2.4.48-3.ph3, 2.4.49-1, 2.4.51-1.amzn2, 2.4.52-1
httpd-devel
2.4.37-47.0.1.module+el8.6.0+20649+083145da.1, 2.4.51-1.amzn2
httpd-filesystem
2.4.37-47.0.1.module+el8.6.0+20649+083145da.1, 2.4.51-1.amzn2
httpd-manual
2.4.37-47.0.1.module+el8.6.0+20649+083145da.1, 2.4.51-1.amzn2
httpd-tools
2.4.37-47.0.1.module+el8.6.0+20649+083145da.1, 2.4.51-1.amzn2
httpd:2.4
8060020220321163517.d63f516d
httpd24
2.4.51-1.94.amzn1
httpd24-devel
2.4.51-1.94.amzn1
httpd24-httpd
0:2.4.34-23.el7.5
httpd24-manual
2.4.51-1.94.amzn1
httpd24-tools
2.4.51-1.94.amzn1
jbcs-httpd24-httpd
0:2.4.51-28.el7jbcs, 0:2.4.51-28.el8jbcs
mod_http2
1.15.7-5.module_el8.6.0+2872+fe0ff7aa, 1.15.7-5.module+el8.6.0+20548+01710940, 1.15.7-5.module+el8.6.0+823+f143cee1
mod_ldap
2.4.37-47.0.1.module+el8.6.0+20649+083145da.1, 2.4.51-1.amzn2
mod_md
1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa, 1:2.0.8-8.module+el8.5.0+20475+4f6a8fd5, 1:2.0.8-8.module+el8.5.0+695+1fa8055e, 2.4.51-1.amzn2
Timeline
Publicly disclosed
Nov 25, 2021
Last updated
Sep 8, 2026
Weakness Type
- CWE-125 Out-of-bounds Read
References
- advisoryhttp://httpd.apache.org/security/vulnerabilities_24.html
- advisoryRHSA-2022:1915
- advisoryRHSA-2022:6753
- advisoryRHSA-2022:7143
- advisoryRHSA-2022:7144
FAQ
Common Questions.
A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS).
Affected: HTTP Server (Apache) versions 12.2.1.3.0, 12.2.1.4.0, >= Apache HTTP Server 2.4; Cloud Backup (Netapp); Clustered Data Ontap (Netapp), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including apache 2.4.49, apache 2.4.49-1, HTTP Server 2.4.49.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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