Buffer overflow in Google Brotli
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.
EPSS: 0.032 (86.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Google Brotli
- Google Llc Brotli — versions stable
- Microsoft .Net
- Microsoft .Net_core
- Microsoft Powershell
- Microsoft Visual_studio_2019
- Microsoft Visual_studio_2022 — versions 17.1
- Canonical Ubuntu_linux — versions 16.04, 18.04, 20.04
- Debian Debian_linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 31, 32, 33
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve-coordination@google.com (x_refsource_CONFIRM, Third Party Advisory, Release Notes)
- cve-coordination@google.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- cve-coordination@google.com (x_refsource_FEDORA, vendor-advisory)
- cve-coordination@google.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- cve-coordination@google.com (x_refsource_FEDORA, vendor-advisory)
- cve-coordination@google.com (x_refsource_FEDORA, vendor-advisory)
- cve-coordination@google.com (x_refsource_FEDORA, vendor-advisory)
- cve-coordination@google.com (x_refsource_FEDORA, vendor-advisory)
- cve-coordination@google.com (x_refsource_FEDORA, vendor-advisory)
- cve-coordination@google.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-8927?
- CVE-2020-8927 is a medium-severity vulnerability in Google Brotli, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 5.3/10. Published 2020-09-15.
- How severe is CVE-2020-8927?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-8927 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.