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.
Published 2021-03-11 01:15:14
Updated 2021-03-17 19:50:40
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2020-1898

0.31%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 67 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-1898

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
MEDIUM AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
NIST

CWE ids for CVE-2020-1898

  • The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.
    Assigned by:
    • cve-assign@fb.com (Secondary)
    • nvd@nist.gov (Primary)

References for CVE-2020-1898

Products affected by CVE-2020-1898

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