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TI-2020-01820 Aliases CVE-2020-1893GHSA-m8q8-334f-8qxg

Out-of-bounds read in Meta HHVM

Priority LOW 35CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

Insufficient boundary checks when decoding JSON in TryParse reads out of bounds memory, potentially leading to 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.

Why it matters now

EPSS 0.01148 66th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MetaHHVM4.45.1; 4.45.0; 4.44.1; 4.44.0; 4.43.1; 4.43.0; 4.42.1; 4.42.0; 4.41.1; 4.41.0; 4.40.1; 4.40.0; 4.39.1; 4.39.0; 4.38.1; 4.33.0 and later; 4.32.1; 4.9.0 and later; 4.8.7; up to 4.8.6—No fix listedCNA
  • HHVM VendorMeta Affected 4.45.1; 4.45.0; 4.44.1; 4.44.0; 4.43.1; 4.43.0; 4.42.1; 4.42.0; 4.41.1; 4.41.0; 4.40.1; 4.40.0; 4.39.1; 4.39.0; 4.38.1; 4.33.0 and later; 4.32.1; 4.9.0 and later; 4.8.7; up to 4.8.6 Fixed in — No fix listed CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*before 4.8.7; 4.9.0 – 4.32.0; 4.33.0 – 4.38.0VulnerableMeta
cpe:2.3:a:facebook:hhvm:4.39.0:*:*:*:*:*:*:*4.39.0VulnerableMeta
cpe:2.3:a:facebook:hhvm:4.40.0:*:*:*:*:*:*:*4.40.0VulnerableMeta
cpe:2.3:a:facebook:hhvm:4.41.0:*:*:*:*:*:*:*4.41.0VulnerableMeta
cpe:2.3:a:facebook:hhvm:4.42.0:*:*:*:*:*:*:*4.42.0VulnerableMeta
cpe:2.3:a:facebook:hhvm:4.43.0:*:*:*:*:*:*:*4.43.0VulnerableMeta
cpe:2.3:a:facebook:hhvm:4.44.0:*:*:*:*:*:*:*4.44.0VulnerableMeta
cpe:2.3:a:facebook:hhvm:4.45.0:*:*:*:*:*:*:*4.45.0VulnerableMeta
  • cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:* Versions before 4.8.7; 4.9.0 – 4.32.0; 4.33.0 – 4.38.0 Vulnerable ·Meta
  • cpe:2.3:a:facebook:hhvm:4.39.0:*:*:*:*:*:*:* Versions 4.39.0 Vulnerable ·Meta
  • cpe:2.3:a:facebook:hhvm:4.40.0:*:*:*:*:*:*:* Versions 4.40.0 Vulnerable ·Meta
  • cpe:2.3:a:facebook:hhvm:4.41.0:*:*:*:*:*:*:* Versions 4.41.0 Vulnerable ·Meta
  • cpe:2.3:a:facebook:hhvm:4.42.0:*:*:*:*:*:*:* Versions 4.42.0 Vulnerable ·Meta
  • cpe:2.3:a:facebook:hhvm:4.43.0:*:*:*:*:*:*:* Versions 4.43.0 Vulnerable ·Meta
  • cpe:2.3:a:facebook:hhvm:4.44.0:*:*:*:*:*:*:* Versions 4.44.0 Vulnerable ·Meta
  • cpe:2.3:a:facebook:hhvm:4.45.0:*:*:*:*:*:*:* Versions 4.45.0 Vulnerable ·Meta

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Facebook HHVM unspecified

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-1893
  2. 2026-10-03 Alias added: GHSA-m8q8-334f-8qxg

References

Patch 1

Advisory 1

  • TI-2018-04659 Improper input validation in Meta HHVM CVSS 3.1CRITICAL 9.8
  • TI-2022-17147 Broken or risky cryptographic algorithm in Meta HHVM CVSS 3.1CRITICAL 9.8
  • TI-2019-08934 Memory corruption in Meta HHVM CVSS 3.1CRITICAL 9.8
  • TI-2021-06352 Heap-based buffer overflow in Meta folly CVSS 3.1CRITICAL 9.8
  • TI-2019-08935 An invalid free in mb_detect_order can cause the application to crash or potentially… CVSS 3.1CRITICAL 9.8
  • TI-2016-05898 Integer overflow in bcmath in Facebook HHVM before 3.15.0 allows attackers to have… CVSS 3.0CRITICAL 9.8
See all 39 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences