HHVM supports the use of an "admin" server which accepts administrative requests over HTTP
Published Oct 26, 2021
8.1
HIGHCVSS 3.1
EPSS 1.79%
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.
Affected products
-
- Version 4.57.0StatusaffectedConstraints<unspecified
- Version 4.79.0StatusaffectedConstraints<unspecified
- Version 4.80.0StatusaffectedConstraints<unspecified
- Version 4.81.0StatusaffectedConstraints<unspecified
- Version 4.82.0StatusaffectedConstraints<unspecified
- Version 4.83.0StatusaffectedConstraints<unspecified
- Version unspecifiedStatusaffectedConstraints<4.56.2
- Version 4.56.2StatusunaffectedConstraints<unspecified
- Version 4.78.1StatusunaffectedConstraints<unspecified
- Version 4.79.1StatusunaffectedConstraints<unspecified
- Version 4.80.1StatusunaffectedConstraints<unspecified
- Version 4.81.1StatusunaffectedConstraints<unspecified
- Version 4.82.1StatusunaffectedConstraints<unspecified
- Version 4.83.1StatusunaffectedConstraints<unspecified
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| HHVM | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:S/C:N/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.79% (0.01789) | 77.57th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.73% (0.01731) | 74.58th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.29% (0.01293) | 77.85th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.81% (0.03805) | 79.93th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.29% (0.01293) | 78.30th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.15% (0.00150) | 52.59th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.15% (0.00150) | 50.36th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00098) | 39.28th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.20% (0.02199) | 81.14th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.20% (0.02199) | 58.00th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.46% (0.01458) | 32.87th | v5 (v2026.06.15) |
| Oct 27, 2021 | 1.46% (0.01458) | 72.78th | v1 |
References (3)
- https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 x_refsource_CONFIRMPatchThird Party Advisory
- https://hhvm.com/blog/2020/11/12/security-update.html x_refsource_CONFIRMVendor Advisory
- https://www.facebook.com/security/advisories/cve-2019-3556 x_refsource_CONFIRMBroken Link
| Link | Providers | Tags |
|---|---|---|
| https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://hhvm.com/blog/2020/11/12/security-update.html | x_refsource_CONFIRMVendor Advisory | |
| https://www.facebook.com/security/advisories/cve-2019-3556 | x_refsource_CONFIRMBroken Link |
Change history (0)
No recorded changes yet.