CVE-2019-3556
HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers,…
- 8.1HighCVSS base score
- 1.8%Exploitation in 30 daysEPSS · top 21% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
HHVM supports the use of an "admin" server which accepts administrative requests over HTTP. One of those request handlers, dump-pcre-cache, can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated, allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2, all versions between 4.57.0 and 4.78.0, as well as 4.79.0, 4.80.0, 4.81.0, 4.82.0, and 4.83.0.
Timeline
ID reserved
By facebook
- 3 years later
· 3 years later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.8% · top 21% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.
Affected products
- unaffected 4.83.1 – < unspecified
- affected 4.83.0 – < unspecified
- unaffected 4.82.1 – < unspecified
- affected 4.82.0 – < unspecified
- unaffected 4.81.1 – < unspecified
- affected 4.81.0 – < unspecified
- unaffected 4.80.1 – < unspecified
- affected 4.80.0 – < unspecified
- unaffected 4.79.1 – < unspecified
- affected 4.79.0 – < unspecified
- unaffected 4.78.1 – < unspecified
- affected 4.57.0 – < unspecified
- unaffected 4.56.2 – < unspecified
- affected unspecified – < 4.56.2
References
References3
- https://hhvm.com/blog/2020/11/12/security-update.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.facebook.com/security/advisories/cve-2019-3556 (opens in a new tab)x_refsource_CONFIRMx_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)
- EUVD EUVD-2019-13193 (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
[](https://cveledger.app/cve/CVE-2019-3556)Record last updated .