Is CVE-2020-1900 in the CISA KEV catalog?

No. CVE-2020-1900 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-1900?

CVE-2020-1900 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2020-1900?

CVE-2020-1900 has an EPSS score of 1.38% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-1900?

Upgrade hhvm to 4.56.1 or later.

CVE & CISA-KEV Catalog

CVE-2020-1900

CRITICAL

9.8

CVSS v3

NVD

Description

When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting anything into it. Otherwise the array might resize, invalidating previously stored references. This pre-reservation was not occurring in HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.

CWE-416Use After Free

How to fix

Remediation Available

hhvmNVD

Affected:>= 4.33.0, < 4.56.1Fixed in:4.56.1CVE-2020-1900derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.38%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

hhvm.com

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.