CVE-2020-1900 is a vulnerability in Facebook Hhvm
Published on March 11, 2021
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.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2020-1900 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2020-1900
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Affected Versions
Facebook HHVM:- Version 4.62.1 and below unspecified is unaffected.
- Version 4.62.0 is affected.
- Version 4.61.1 and below unspecified is unaffected.
- Version 4.61.0 is affected.
- Version 4.60.1 and below unspecified is unaffected.
- Version 4.60.0 is affected.
- Version 4.59.1 and below unspecified is unaffected.
- Version 4.59.0 is affected.
- Version 4.58.2 and below unspecified is unaffected.
- Version 4.58.0 and below unspecified is affected.
- Version 4.57.1 and below unspecified is unaffected.
- Version 4.57.0 is affected.
- Version 4.56.1 and below unspecified is unaffected.
- Version 4.33.0 and below unspecified is affected.
- Version 4.32.3 and below unspecified is unaffected.
- Version unspecified and below 4.32.3 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.