CVE-2019-11936

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.5%, top 29% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Various APC functions accept keys containing null bytes as input, leading to premature truncation of input. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
71.1%
KEV
Not listed

Published

December 4, 2019

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Jun 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Facebook

https://www.facebook.com/security/advisories/cve-2019-11936
generic

Security Update | HHVM

https://hhvm.com/blog/2019/10/28/security-update.html
github_commit

commit f57df6d8cf33 (facebook/hhvm)

Fix landed in facebook/hhvm commit f57df6d8cf33 — awaiting tagged release

https://github.com/facebook/hhvm/commit/f57df6d8cf33cb14c40f52287da29360e7003373

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:19 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  5. 2026-07-20 17:04 UTCEPSS rescore
  6. 2026-07-20 00:48 UTCOSV refresh
  7. 2026-07-19 14:28 UTCEPSS rescore
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  1. 2026-07-04 06:28 UTCEPSS rescore
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  3. 2026-07-02 16:56 UTCEPSS rescore
  4. 2026-07-02 15:52 UTCOSV refresh
  5. 2026-07-01 15:03 UTCEPSS rescore
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  7. 2026-06-30 23:20 UTCEPSS rescore
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  27. 2026-06-19 19:23 UTCEPSS rescore
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  29. 2026-06-18 17:50 UTCEPSS rescore
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  35. 2026-06-14 13:13 UTCOSV refresh
  36. 2026-06-13 22:58 UTCEPSS rescore
  37. 2026-06-12 23:09 UTCEPSS rescore
  38. 2026-06-11 13:58 UTCEPSS rescore
  39. 2026-06-11 13:58 UTCEPSS rescore
  40. 2026-06-10 22:16 UTCEPSS rescore
  41. 2026-06-10 13:19 UTCEPSS rescore
  42. 2026-06-08 14:15 UTCEPSS rescore
  43. 2026-06-08 14:14 UTCEPSS rescore
  44. 2026-06-07 15:23 UTCEPSS rescore
  45. 2026-06-07 15:22 UTCEPSS rescore
  46. 2026-06-06 13:45 UTCEPSS rescore
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  48. 2026-06-05 22:45 UTCEPSS rescore
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  50. 2026-06-05 06:08 UTCEPSS rescore
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  57. 2026-05-31 22:29 UTCEPSS rescore
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  61. 2026-05-29 13:42 UTCEPSS rescore
  62. 2026-05-28 13:43 UTCEPSS rescore
  63. 2026-05-27 13:38 UTCEPSS rescore
  64. 2026-05-27 10:55 UTCEG score recompute
  65. 2026-05-27 10:55 UTCGHSA enrichment
  66. 2026-05-26 13:42 UTCEPSS rescore
  67. 2026-05-26 13:42 UTCEPSS rescore
  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-26 07:17 UTCEPSS rescore
  70. 2026-05-25 22:16 UTCOSV refresh

Frequently asked(5)

What is CVE-2019-11936?
CVE-2019-11936 is a critical vulnerability published on December 4, 2019. Various APC functions accept keys containing null bytes as input, leading to premature truncation of input. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.
When was CVE-2019-11936 disclosed?
CVE-2019-11936 was first published in the National Vulnerability Database on December 4, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-11936 actively exploited?
CVE-2019-11936 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-11936?
CVE-2019-11936 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-11936?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11936, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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