Vulnerability Details : CVE-2020-1893
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.
Vulnerability category: Denial of service
Products affected by CVE-2020-1893
- cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:4.45.0:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:4.44.0:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:4.43.0:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:4.42.0:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:4.41.0:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:4.40.0:*:*:*:*:*:*:*
- cpe:2.3:a:facebook:hhvm:4.39.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-1893
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 45 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-1893
| 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-2020-1893
-
The product reads data past the end, or before the beginning, of the intended buffer.Assigned by:
- cve-assign@fb.com (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2020-1893
-
https://hhvm.com/blog/2020/02/20/security-update.html
Security Update | HHVMVendor Advisory
-
https://github.com/facebook/hhvm/commit/bd586671a3c22eb2f07e55f11b3ce64e1f7961e7
Fix a buffer-overrun in SimpleParser · facebook/hhvm@bd58667 · GitHubPatch
Jump to