Apache VCL versions 2.1 through 2.5 do not properly validate form input when processing a submitted block allocation. The form data is…

Description

Apache VCL versions 2.1 through 2.5 do not properly validate form input when processing a submitted block allocation. The form data is then used as an argument to the php built in function strtotime. This allows for an attack against the underlying implementation of that function. The implementation of strtotime at the time the issue was discovered appeared to be resistant to a malicious attack. However, all VCL systems running versions earlier than 2.5.1 should be upgraded or patched. This vulnerability was found and reported to the Apache VCL project by ADLab of Venustech.

Scores

EPSS (exploitation in 30 days)

2.1% · top 18% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

• improper form validation in block allocation management
• CWE-20 (opens in a new tab)All about CWE-20 and its CVEs

Affected products

• Apache · VCL

  • affected 2.1 through 2.5

References (2)

• [vcl-dev] 20190729 [CVE-2018-11773] Apache VCL improper form validation in block allocation management (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [announce] 20190729 [CVE-2018-11773] Apache VCL improper form validation in block allocation management (opens in a new tab)mailing-listx_refsource_MLISTx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2018-11773](https://trackcve.app/badge/CVE-2018-11773.svg)](https://trackcve.app/cve/CVE-2018-11773)

Record last updated 5 Aug 2024, 08:17 UTC.