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CVE-2020-8927

MEDIUMCVSS 6.5/10EPSS 3.24%

Last modified

CVE-2020-8927 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your Brotli library to 1.0.8 or later. EPSS estimates a 3.24% chance of exploitation in the next 30 days.

Description

A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your Brotli library to 1.0.8 or later. If one cannot update, we recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
3.24%

86.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
GoogleBrotli< 1.0.8
DebianDebian Linux9.0
DebianDebian Linux10.0
FedoraprojectFedora31
FedoraprojectFedora32
FedoraprojectFedora33
FedoraprojectFedora34
FedoraprojectFedora35
FedoraprojectFedora36
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux20.04
OpensuseLeap15.2
Microsoft.Net>= 5.0, <= 5.0.14
Microsoft.Net Core>= 3.1, <= 3.1.22
MicrosoftPowershell>= 7.0, < 7.0.9
MicrosoftPowershell>= 7.1, < 7.1.6
MicrosoftPowershell>= 7.2, < 7.2.2
MicrosoftVisual Studio 2019>= 16.0, <= 16.11
MicrosoftVisual Studio 2022>= 17.0, <= 17.0.7
MicrosoftVisual Studio 202217.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-8927?
A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your Brotli library to 1.0.8 or later. If one cannot update, we recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.
How severe is CVE-2020-8927?
CVE-2020-8927 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 3.24% probability of exploitation in the next 30 days.
How do I fix CVE-2020-8927?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8927?

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Source: NVD / NIST