HOMEVULNERABILITIESCVE-2016-1000005
CRITICAL

CVE-2016-1000005

CWE-843Published: February 19, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

mcrypt_get_block_size did not enforce that the provided "module" parameter was a string, leading to type confusion if other types of data were passed in. This issue affects HHVM versions prior to 3.9.5, all versions between 3.10.0 and 3.12.3 (inclusive), and all versions between 3.13.0 and 3.14.1 (inclusive).

NVD Source

Technical Analysis

CVE-2016-1000005 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

facebook1 product(s)
hhvm
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89
PATCHhttps://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89
ADVISORYhttps://www.facebook.com/security/advisories/cve-2016-1000005
ADVISORYhttps://www.facebook.com/security/advisories/cve-2016-1000005

All References (4)

→
https://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89Patch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2016-1000005Third Party Advisory
→
https://github.com/facebook/hhvm/commit/39e7e177473350b3a5c34e8824af3b98e25efa89Patch · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2016-1000005Third Party Advisory

Quick Facts

CVE IDCVE-2016-1000005
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-843
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 19, 2020

Related CVEs (CWE-843)

CVE-2010-2299
10.0
CVE-2021-33970
10.0
CVE-2019-7971
9.8
CVE-2019-9819
9.8
CVE-2019-14537
9.8
CVE-2019-7970
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-1000005 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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