No exploitation reportedFix available

CVE-2020-1892

Q: Is CVE-2020-1892 actively exploited?

Active exploitation of CVE-2020-1892 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-1892?

CVE-2020-1892 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

No exploitation reported by the sources we read.

Published2020-03-03
Fixed in4.8.7
WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Insufficient boundary checks when decoding JSON in JSON_parser allows read access to out of bounds memory, potentially leading to information leak and DOS. This issue affects HHVM 4.45.0, 4.44.0, 4.43.0, 4.42.0, 4.41.0, 4.40.0, 4.39.0, versions between 4.33.0 and 4.38.0 (inclusive), versions between 4.9.0 and 4.32.0 (inclusive), and versions prior to 4.8.7.

Timeline

dates in UTC

2020-03-0315:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-1892?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-1892?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Facebook hhvm

Branch	Affected	Fixed in	Source
4.8	< 4.8.7	4.8.7	NVD
4.x	≥ 4.9.0, ≤ 4.32.0	no fix published	NVD
4.x	≥ 4.33.0, ≤ 4.38.0	no fix published	NVD
4.39	= 4.39.0	no fix published	NVD
4.40	= 4.40.0	no fix published	NVD
4.41	= 4.41.0	no fix published	NVD
4.42	= 4.42.0	no fix published	NVD
4.43	= 4.43.0	no fix published	NVD
4.44	= 4.44.0	no fix published	NVD
4.45	= 4.45.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Facebook hhvm to 4.8.7

Advisories and patches

github.comPatch
hhvm.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.18.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
CNAweakness (CWE)CWE-125read 2026-10-23
NVDweakness (CWE)CWE-125read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Published: 2020-03-03
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-1892?

Is CVE-2020-1892 actively exploited?

Active exploitation of CVE-2020-1892 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-1892?

CVE-2020-1892 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

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