Vulnerability · Published Mar 11, 2021 · Assigned by facebook
CVE-2020-1898
High 7.5
In plain English
A high-severity security flaw in HHVM from Facebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities).
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.2%top 31.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
The fb_unserialize function did not impose a depth limit for nested deserialization. That meant a maliciously constructed string could cause deserialization to recurse, leading to stack exhaustion. 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.
Affected products (as reported)
Weakness: CWE-674
References
- https://hhvm.com/blog/2020/06/30/security-update.html x_refsource_CONFIRM
- https://github.com/facebook/hhvm/commit/1746dfb11fc0048366f34669e74318b8278a684c x_refsource_MISC