CVE-2020-8927
CVE-2020-8927 is a medium-severity vulnerability in Google Brotli with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- CVSS v2: 6.4
- EPSS exploit prediction: 3% (87th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-120
- Affected product: Google Brotli
- Published:
- Last modified:
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.
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 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2020-8927 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-8927?
- CVE-2020-8927 primarily affects Google Brotli. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-8927?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2020-8927 published?
- CVE-2020-8927 was published on 2020-09-15 and last updated on 2026-06-17.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00108.html
- https://github.com/google/brotli/releases/tag/v1.0.9
- https://lists.debian.org/debian-lts-announce/2020/12/msg00003.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/356JOYTWW4BWSZ42SEFLV7NYHL3S3AEH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4TOGTZ2ZWDH662ZNFFSZVL3M5AJXV6JF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4E265WKWKYMK2RYYSIXBEGZTDY5IQE6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M4VCDOJGL6BK3HB4XRD2WETBPYX2ITF6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMBKACMLSRX7JJSKBTR35UOEP2WFR6QP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQLM7ABVCYJLF6JRPF3M3EBXW63GNC27/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W23CUADGMVMQQNFKHPHXVP7RPZJZNN6I/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WW62OZEY2GHJL4JCOLJRBSRETXDHMWRK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXEQ3GQVELA2T4HNZG7VPMS2HDVXMJRG/
- https://usn.ubuntu.com/4568-1/
- https://www.debian.org/security/2020/dsa-4801
Affected products (19)
- cpe:2.3:a:google:brotli:*:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2022:17.1:*:*:*:*:*:*:*
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