What is the severity of CVE-2020-1921?

CVE-2020-1921 has a severity rating of 7.5 (high).

How can I fix CVE-2020-1921?

To fix CVE-2020-1921, update your HHVM to version 4.56.3 or later, 4.80.2 or later, 4.93.2 or later, or 4.94.0 if you are using that specific version.

Where can I find more information about CVE-2020-1921?

You can find more information about CVE-2020-1921 on the GitHub commit page (https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca) and the HHVM blog post (https://hhvm.com/blog/2021/02/25/security-update.html).

Vulnerability/
CVE-2020-1921

high

7.5

CWE

787 121

10/3/2021

15/3/2021

CVE-2020-1921

Q: What is CVE-2020-1921?

CVE-2020-1921 is a vulnerability in the crypt function of 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.

Q: How does CVE-2020-1921 affect HHVM?

CVE-2020-1921 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. It does not affect versions 4.95.0, 4.96.0, 4.97.0, and 4.98.0.

First published: Wed Mar 10 2021(Updated: )

In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the 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.

Credit: cve-assign@fb.com

Affected Software	Affected Version	How to fix
Facebook HHVM	<4.56.3
Facebook HHVM	>=4.57.0<4.80.2
Facebook HHVM	>=4.81.0<4.93.2
Facebook HHVM	=4.94.0
Facebook HHVM	=4.95.0
Facebook HHVM	=4.96.0
Facebook HHVM	=4.97.0
Facebook HHVM	=4.98.0

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Reference Links

Frequently Asked Questions

What is CVE-2020-1921?
CVE-2020-1921 is a vulnerability in the crypt function of 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.
How does CVE-2020-1921 affect HHVM?
CVE-2020-1921 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. It does not affect versions 4.95.0, 4.96.0, 4.97.0, and 4.98.0.
What is the severity of CVE-2020-1921?
CVE-2020-1921 has a severity rating of 7.5 (high).
How can I fix CVE-2020-1921?
To fix CVE-2020-1921, update your HHVM to version 4.56.3 or later, 4.80.2 or later, 4.93.2 or later, or 4.94.0 if you are using that specific version.
Where can I find more information about CVE-2020-1921?
You can find more information about CVE-2020-1921 on the GitHub commit page (https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca) and the HHVM blog post (https://hhvm.com/blog/2021/02/25/security-update.html).

collector/nvd-index
agent/references
agent/severity
agent/weakness
agent/author
agent/tags
agent/description
agent/type
agent/event
agent/softwarecombine
vendor/facebook
canonical/facebook hhvm
version/facebook hhvm/4.57.0
version/facebook hhvm/4.81.0
version/facebook hhvm/4.94.0
version/facebook hhvm/4.95.0
version/facebook hhvm/4.96.0
version/facebook hhvm/4.97.0
version/facebook hhvm/4.98.0

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