CVE-2021-36160

mediumpriority · attend · 52EPSS 0.629 · 99 %ileDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

62.9% (99th) EPSS

CVSS 5 · medium

Is it mine?

96 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-24

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).

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Expresswaycisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Firepower Extensible Operating System (FXOS)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
WorkaroundCisco Expresswaycisco_csaf
Any workarounds will be documented in the product-specific Cisco bugs, which are identified in the Vulnerable Products ["#vp"] section of this advisory.
WorkaroundCisco Firepower Extensible Operating System (FXOS)cisco_csaf
Any workarounds will be documented in the product-specific Cisco bugs, which are identified in the Vulnerable Products ["#vp"] section of this advisory.

cvss

Technical severity, 0–10. One row per scoring source.

9.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 5–9

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Hsecondary · CVSS-BT (t0sche)

v3.19criticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · Cisco PSIRT US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USprimaryCWE-125US

affected products (96)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Apache HTTP Server <2.4.49all versionscert_bundDE
Avaya Aura Application Enablement Servicesall versionscert_bundDEcpe:/a:avaya:aura_application_enablement_services:-
Avaya Aura Communication Managerall versionscert_bundDEcpe:/a:avaya:communication_manager:-
Avaya Aura Experience Portalall versionscert_bundDEcpe:/a:avaya:aura_experience_portal:-
Avaya Aura Session Managerall versionscert_bundDEcpe:/a:avaya:session_manager:-
Avaya Aura System Managerall versionscert_bundDEcpe:/a:avaya:aura_system_manager:-
Avaya Web License Managerall versionscert_bundDEcpe:/a:avaya:web_license_manager:-
Broadcom Brocade Switchall versionscert_bundDEcpe:/h:brocade:switch:-
Cisco Expresswayall versionscert_bundDEcpe:/a:cisco:expressway_software:-
Cisco FXOSall versionscert_bundDEcpe:/o:cisco:fxos:-
Cisco Firepowerall versionscert_bundDEcpe:/a:cisco:firepower:-
Cisco Prime Collaboration Provisioningall versionscert_bundDEcpe:/a:cisco:prime_collaboration:::provisioning
Cisco Prime Infrastructureall versionscert_bundDEcpe:/a:cisco:prime_infrastructure:-
Cisco Security Manager (CSM)all versionscert_bundDEcpe:/a:cisco:security_manager:-
Cisco TelePresenceall versionscert_bundDEcpe:/h:cisco:telepresence:video_communication_server
Cisco Unified Computing System (UCS)all versionscert_bundDEcpe:/h:cisco:unified_computing_system:-
Cisco Wide Area Application Servicesall versionscert_bundDEcpe:/a:cisco:wide_area_application_services:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
F5 BIG-IPall versionscert_bundDEcpe:/a:f5:big-ip:-

showing 20 of 96

advisories (4)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-0724Apache HTTP Server: Mehrere SchwachstellenDeutsch2021-09-16csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um Sicherheitsvorkehrungen zu umgehen, vertrauliche Informationen offenzulegen und einen Denial of Service Zustand herzustellen.
WID-SEC-W-2024-1591Juniper JUNOS: Mehrere SchwachstellenDeutsch2024-07-10csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Juniper JUNOS ausnutzen, um einen Denial of Service zu verursachen, Informationen offenzulegen, Privilegien zu erweitern und Sicherheitsmechanismen inklusive zu umgehen.
cisco-sa-apache-httpd-2.4.49-VWL69sWQMultiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 20212021-11-24csaf · cisco_csafUS
On September 16, 2021, the Apache Software Foundation disclosed five vulnerabilities affecting the Apache HTTP Server (httpd) 2.4.48 and earlier releases. For a description of these vulnerabilities, see the Apache HTTP Server 2.4.49 section ["https://httpd.apache.org/security/vulnerabilities_24.html#2.4.49"] of the Apache HTTP Server 2.4 vulnerabilities webpage. This advisory will be updated as additional information becomes available.
BIT-apache-2021-36160mod_proxy_uwsgi out of bound read2024-03-06vendor · osvUS
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).

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund cisco_csaf osv NVD CVE.org MITRE

published 2021-09-16modified 2026-06-17

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+11779 more

references (99)

External citations — patches, advisories, analysis.

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