HOME VULNERABILITIESCVE-2020-1918

HIGH

CVE-2020-1918

CWE-127Published: March 10, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.

Technical Analysis

CVE-2020-1918 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), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

facebook1 product(s)

hhvm

Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

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/08193b7f0cd3910256e00d599f0f3eb2519c44ca

PATCHhttps://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca

ADVISORYhttps://hhvm.com/blog/2021/02/25/security-update.html

ADVISORYhttps://hhvm.com/blog/2021/02/25/security-update.html

All References (4)

→

https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44caPatch · Third Party Advisory

→

https://hhvm.com/blog/2021/02/25/security-update.htmlRelease Notes · Vendor Advisory

→

https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44caPatch · Third Party Advisory

→

https://hhvm.com/blog/2021/02/25/security-update.htmlRelease Notes · Vendor Advisory

Quick Facts

CVE IDCVE-2020-1918

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-127

CISA KEVNo

Affected1 vendor(s)

PublishedMar 10, 2021

Related CVEs (CWE-127)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-1918 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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