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Vulnerabilities

Vulnerability · CVE-2018-11763

apache2 CVE-2018-11763

Published Feb 22, 2022 · catalog updated Feb 22, 2022 · Apache HTTP Server

Patch now

CVE-2018-11763 is in the CISA known-exploited catalog. Confirm Apache HTTP Server against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
50.85%
Remediation
Remediation guidance
Affected products
alpine apache2 · vendor Apache HTTP Server

In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.

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.

  • alpine apache22.4.35-r0
  • vendor Apache HTTP Serverversion unspecified

How to fix CVE-2018-11763

What to do

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

Should you patch?

CVE-2018-11763 is in the CISA known-exploited catalog. Confirm Apache HTTP Server against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 2.4.35-r0. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 50.85%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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. Feb 22, 2022 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. Oct 17, 2026 · Alpine Linux Security

    Detected

    CVE-2018-11763 is fixed in Alpine edge package apache2 2.4.35-r0 (main).

Sources

  • Alpine Linux SecurityPackage advisoryCVE-2018-11763

    CVE-2018-11763 is fixed in Alpine edge package apache2 2.4.35-r0 (main).

    security.alpinelinux.org
  • CVE.orgVulnerability recordCVE-2018-11763

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2018-11763

    30-day exploitation probability 50.8%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2018-11763

    In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 p

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.