ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2022-37436

Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body.

Published Jan 17, 2023 · catalog updated Jun 17, 2026 · http server

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2022-37436 is not in CISA KEV. FIRST estimates a 52.72% chance of exploitation in the next 30 days. Check whether you run http server.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
52.72%
Remediation
Version ranges on file
Affected products
cpe apache/http server

Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/http server< 2.4.55

How to fix CVE-2022-37436

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2022-37436 is not in CISA KEV. FIRST estimates a 52.72% chance of exploitation in the next 30 days. Check whether you run http server.

Which versions are affected?

Compare what you have installed with apache/http server < 2.4.55. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-113; CWE-436. EPSS 52.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Apache HTTP Server security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 17, 2023 · Monitored products — critical

    Detected

    Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.

Sources

  • CVE.orgVulnerability recordCVE-2022-37436

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2022-37436

    30-day exploitation probability 52.72%

    first.org
  • Monitored products — criticalVendor advisoryCVE-2022-37436

    Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 4, 2026