Insufficient boundary checks when decoding JSON in TryParse reads out of bounds memory, potentially leading to DOS. This issue affects…

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

1.1% · top 33% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• CWE-125: Out-of-bounds Read (CWE-125) (opens in a new tab)All about CWE-125 and its CVEs

Affected products

• Facebook · HHVM

  • affected 4.45.1
  • affected 4.45.0
  • affected 4.44.1
  • affected 4.44.0
  • affected 4.43.1
  • affected 4.43.0
  • affected 4.42.1
  • affected 4.42.0
  • affected 4.41.1
  • affected 4.41.0
  • affected 4.40.1
  • affected 4.40.0
  • affected 4.39.1
  • affected 4.39.0
  • affected 4.38.1
  • affected 4.33.0 – < unspecified
  • affected 4.32.1
  • affected 4.9.0 – < unspecified
  • affected 4.8.7
  • affected unspecified – ≤ 4.8.6

References (2)

• https://hhvm.com/blog/2020/02/20/security-update.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://github.com/facebook/hhvm/commit/bd586671a3c22eb2f07e55f11b3ce64e1f7961e7 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2020-1893](https://trackcve.app/badge/CVE-2020-1893.svg)](https://trackcve.app/cve/CVE-2020-1893)

Record last updated 4 Aug 2024, 06:53 UTC.