Is CVE-2020-1899 in the CISA KEV catalog?

No. CVE-2020-1899 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-1899?

CVE-2020-1899 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-1899?

CVE-2020-1899 has an EPSS score of 1.22% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-1899?

Upgrade hhvm to 4.56.1 or later.

CVE & CISA-KEV Catalog

CVE-2020-1899

HIGH

7.5

CVSS v3

NVD

Description

The unserialize() function supported a type code, "S", which was meant to be supported only for APC serialization. This type code allowed arbitrary memory addresses to be accessed as if they were static StringData objects. This issue affected 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-822Untrusted Pointer Dereference CWE-119Buffer Overflow

How to fix

Remediation Available

hhvmNVD

Affected:>= 4.33.0, < 4.56.1Fixed in:4.56.1CVE-2020-1899derived 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

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.22%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Patch1

github.com

Vendor Advisory1

hhvm.com

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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.