CVE-2021-36160: mod_proxy_uwsgi out of bound read
Vulnerability summary
CVE-2021-36160 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in apache software foundation apache http server. EPSS estimates a 62.89% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 63% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 10 · Related 5Timeline
- 16-09-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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).
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
62.89%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 62.89% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Oracle6 products
- communications_cloud_native_core_network_function_cloud_native_environment1.10.0
- enterprise_manager_base_platform13.4.0.0 | 13.5.0.0
- http_server12.2.1.3.0 | 12.2.1.4.0
- instantis_enterprisetrack17.1 | 17.2 | 17.3
- peoplesoft_enterprise_peopletools8.58
Debian3 products
- apache2< 2.4.49-1
- uwsgi< 2.0.14+20161117-3+deb9u4 | All versions (No fix recorded)
- debian_linuxEOL9.0 | 10.0 | 11.0
Netapp3 products
Alpine1 product
- apache2< 2.4.49-r0
Apache1 product
- http_server≥ 2.4.30, < 2.4.49
Apache software foundation1 product
- apache http server≥ Apache HTTP Server 2.4, ≤ 2.4.48
Broadcom1 product
Fedoraproject1 product
- fedoraEOL34 | 35
Ubuntu1 product
- apache2< 2.4.41-4ubuntu3.5
9 vendors · 18 products
References
33 links
lists.debian.org/debian-lts-announce/2021/09/msg00016.htmlMailing ListX Refsource MLISTThird Party Advisory
Show all 33 references
- lists.debian.org/debian-lts-announce/2021/10/msg00016.htmlMailing ListX Refsource MLISTThird Party Advisory
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQVendor AdvisoryX Refsource CISCOThird Party Advisory
