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CVE-2022-36760· NVD / CVE Program· CNA apache

Apache HTTP Server: mod_proxy_ajp Possible request smuggling

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in mod_proxy_ajp of Apache HTTP Server allows an attacker to smuggle requests to the AJP server it forwards requests to. This issue affects Apache HTTP Server Apache HTTP Server 2.4 version 2.4.54 and prior versions.

CriticalCVSS 9.0 · v3.1—No exploit Fix available

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Published
Jan 17, 2023
Updated
Jun 17, 2026
EPSS
1.9% · 79th percentile
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Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
36 / 40 · 9.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.9%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Affected systems

VendorProduct
apachehttp server

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache http server2.4.0 and later · before 2.4.55

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache HTTP Server

    • 2.4 and later · up to and including 2.4.54affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8httpdbefore 2.4.37-51.module_el8.7.0+3405+9516b832.12.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8httpd-develbefore 2.4.37-51.module_el8.7.0+3405+9516b832.12.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8httpd-filesystembefore 2.4.37-51.module_el8.7.0+3405+9516b832.12.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8httpd-manualbefore 2.4.37-51.module_el8.7.0+3405+9516b832.12.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8httpd-toolsbefore 2.4.37-51.module_el8.7.0+3405+9516b832.12.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8mod_http2before 1.15.7-5.module_el8.6.0+3031+fb177b091.15.7-5.module_el8.6.0+3031+fb177b09
AlmaLinux:8mod_http2before 1.15.7-5.module_el8.6.0+2872+fe0ff7aa1.15.7-5.module_el8.6.0+2872+fe0ff7aa
AlmaLinux:8mod_ldapbefore 2.4.37-51.module_el8.7.0+3405+9516b832.12.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8mod_mdbefore 1:2.0.8-8.module_el8.6.0+3031+fb177b091:2.0.8-8.module_el8.6.0+3031+fb177b09
AlmaLinux:8mod_mdbefore 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
AlmaLinux:8mod_proxy_htmlbefore 1:2.4.37-51.module_el8.7.0+3405+9516b832.11:2.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8mod_sessionbefore 2.4.37-51.module_el8.7.0+3405+9516b832.12.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:8mod_sslbefore 1:2.4.37-51.module_el8.7.0+3405+9516b832.11:2.4.37-51.module_el8.7.0+3405+9516b832.1
AlmaLinux:9httpdbefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9httpd-corebefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9httpd-develbefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9httpd-filesystembefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9httpd-manualbefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9httpd-toolsbefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9mod_ldapbefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9mod_luabefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9mod_proxy_htmlbefore 1:2.4.53-7.el9_1.11:2.4.53-7.el9_1.1
AlmaLinux:9mod_sessionbefore 2.4.53-7.el9_1.12.4.53-7.el9_1.1
AlmaLinux:9mod_sslbefore 1:2.4.53-7.el9_1.11:2.4.53-7.el9_1.1

+96

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV
    99Now
  • CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV
    99Now
  • CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV
    96Now
  • CVE-2019-0211In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes orKEV
    81Now
  • CVE-2021-44790Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier
    68This week
  • CVE-2010-0425modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 through 2.2.14, and 2.3.x before 2.3.7, w
    68This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:httpd2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-core2.4.53-7.el9_1.1 · AlmaLinux:9Package registry (OSV)
almalinux:httpd-devel2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-filesystem2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-manual2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:httpd-tools2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:mod_http21.15.7-5.module_el8.6.0+2872+fe0ff7aa · AlmaLinux:8Package registry (OSV)
almalinux:mod_ldap2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:mod_md1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa · AlmaLinux:8Package registry (OSV)
almalinux:mod_proxy_html1:2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:mod_session2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
almalinux:mod_ssl1:2.4.37-51.module_el8.7.0+3405+9516b832.1 · AlmaLinux:8Package registry (OSV)
alpine:apache22.4.55-r0 · Alpine:v3.14Package registry (OSV)
debian:apache22.4.55-1 · Debian:12Package registry (OSV)
opensuse:apache22.4.51-150400.6.6.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:httpd0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-debuginfo0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-debugsource0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-devel0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-filesystem0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-manual0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-tools0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:httpd-tools-debuginfo0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:mod_http20:1.15.7-5.module+el8.6.0+13996+01710940 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:mod_http2-debuginfo0:1.15.7-5.module+el8.6.0+13996+01710940 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:mod_http2-debugsource0:1.15.7-5.module+el8.6.0+13996+01710940 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:mod_ldap0:2.4.37-51.module+el8.7.0+18026+7b169787.1 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:httpd0:2.4.37-51.module+el8.7.0+1059+126e9251 · Rocky Linux:8Package registry (OSV)
rocky linux:mod_http20:1.15.7-5.module+el8.6.0+823+f143cee1 · Rocky Linux:8Package registry (OSV)
rocky linux:mod_md1:2.0.8-8.module+el8.5.0+695+1fa8055e · Rocky Linux:8Package registry (OSV)

+2

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

  • ZeddYu_LuQi'anxin Research Institute of Legendsec at Qi'anxin Groupfinder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records