Home/CVE/In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that th
CVE

CVE-2020-1921

In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that th

In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the buffer. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.

HIGH · CVSS 7.5 EPSS 0.00593
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

4
facebook hhvm< 4.56.3
facebook hhvm>= 4.57.0 and < 4.80.2
facebook hhvm>= 4.81.0 and < 4.93.2
facebook hhvmall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve-assign@fb.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Mar 2021 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44caPatchThird Party Advisory
https://hhvm.com/blog/2021/02/25/security-update.htmlVendor Advisory
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