CVE-2016-6871: facebook hhvm Integer Overflow or Wraparound
CVSS: 9.8v3.0CriticalModified
AliasesUBUNTU-CVE-2016-6871
Published 17-02-2017Last modified 06-08-2024
Vulnerability summary
CVE-2016-6871 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in facebook hhvm. EPSS estimates a 2.33% chance of exploitation in the next 30 days, higher than 83.2% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.0 (NVD)EPSS score
2.33%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 17-02-2017PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
Integer overflow in bcmath in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors, which triggers a buffer overflow.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.33%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
0.00 pp
From 2.33% on 20-09-2026
20-09-202620-10-2026
EPSS score2.33%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Facebook1 product
- hhvm≤ 3.14.5
Ubuntu1 product
- hhvmAll versions (No fix recorded)
2 vendors · 2 products
References
5 links- www.openwall.com/lists/oss-security/2016/08/11/1Mailing ListX Refsource MLISTPatchThird Party Advisory
- github.com/facebook/hhvm/commit/c00fc9d3003eb06226b58b6a48555f1456ee2475X Refsource CONFIRMPatchREPORT
- www.openwall.com/lists/oss-security/2016/08/19/1Mailing ListX Refsource MLISTPatchThird Party Advisory