CVE-2020-8927

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 3%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
5.3
EG Score
5.3(low)
EPSS
86.7%
KEV
Not listed

Published

September 15, 2020

Last Modified

May 29, 2026

References (14)

Vendor Advisories for CVE-2020-8927(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-brotli (1.0.3-1ubuntu1~16.04.2) @ xenial2026-05-23ubuntu
redhatrh-dotnet50-dotnet-0:5.0.212-1.el7_92022-03-10redhat
redhatdotnet3.1-0:3.1.417-1.el8_52022-03-10redhat
redhatdotnet5.0-0:5.0.212-1.el8_52022-03-10redhat
redhatrh-dotnet31-dotnet-0:3.1.417-1.el7_92022-03-10redhat
redhatbrotli-0:1.0.6-3.el82021-05-18redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(50 across 4 ecosystems)
NuGet(46)
PackageVulnerable rangeFixed inDependents
Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.android-arm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.android-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.android-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.android-x866.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.browser-wasm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.android-arm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.android-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.android-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.android-x866.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.browser-wasm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.ios-arm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.ios-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.iossimulator-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.iossimulator-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.iossimulator-x866.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.maccatalyst-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.maccatalyst-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.tvos-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.tvossimulator-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.tvossimulator-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm64.Msi.x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm.Msi.x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-x64.Msi.x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-x866.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-x86.Msi.x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.browser-wasm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.browser-wasm.Msi.x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.browser-wasm5.0.0 ... 5.0.9 (15 versions)5.0.15—
Microsoft.NETCore.App.Runtime.linux-arm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.linux-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.linux-musl-arm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.linux-musl-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.linux-musl-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.linux-x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm6.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm64.Msi.arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm64.Msi.x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm64.Msi.x866.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm.Msi.arm646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm.Msi.x646.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-arm.Msi.x866.0.0, 6.0.1, 6.0.26.0.3—
Microsoft.NETCore.App.Runtime.Mono.android-x646.0.0, 6.0.1, 6.0.26.0.3—
crates.io(2)
PackageVulnerable rangeFixed inDependents
brotli-sys———
compu-brotli-sys—1.0.9—
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/google/brotli———
PyPI(1)
PackageVulnerable rangeFixed inDependents
brotli0.5.2 ... 1.0.7 (6 versions)1.0.8—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:25 UTCEPSS rescore
  2. 2026-07-11 08:25 UTCEPSS rescore
  3. 2026-07-09 19:07 UTCEPSS rescore
  4. 2026-07-08 15:12 UTCEPSS rescore
  5. 2026-07-07 13:43 UTCEPSS rescore
  6. 2026-07-06 16:25 UTCEPSS rescore
  7. 2026-07-06 02:21 UTCEPSS rescore
  8. 2026-07-06 02:21 UTCEPSS rescore
  9. 2026-07-05 02:28 UTCEPSS rescore
  10. 2026-07-05 02:28 UTCEPSS rescore
  11. 2026-07-04 06:29 UTCEPSS rescore
  12. 2026-07-04 06:29 UTCEPSS rescore
  13. 2026-07-02 16:57 UTCEPSS rescore
  14. 2026-07-01 15:03 UTCEPSS rescore
  15. 2026-06-30 23:20 UTCEPSS rescore
  16. 2026-06-30 23:20 UTCEPSS rescore
  17. 2026-06-28 14:05 UTCEPSS rescore
  18. 2026-06-28 04:54 UTCEPSS rescore
  19. 2026-06-28 04:54 UTCEPSS rescore
  20. 2026-06-27 03:06 UTCEPSS rescore
  21. 2026-06-27 03:06 UTCEPSS rescore
  22. 2026-06-25 13:48 UTCEPSS rescore
  23. 2026-06-25 13:48 UTCEPSS rescore
  24. 2026-06-24 14:03 UTCEPSS rescore
  25. 2026-06-24 14:03 UTCEPSS rescore
Show 53 more
  1. 2026-06-24 12:48 UTCOSV refresh
  2. 2026-06-23 21:31 UTCEPSS rescore
  3. 2026-06-23 21:31 UTCEPSS rescore
  4. 2026-06-22 14:23 UTCEPSS rescore
  5. 2026-06-21 01:57 UTCEPSS rescore
  6. 2026-06-21 01:57 UTCEPSS rescore
  7. 2026-06-19 19:24 UTCEPSS rescore
  8. 2026-06-19 19:24 UTCEPSS rescore
  9. 2026-06-18 17:51 UTCEPSS rescore
  10. 2026-06-18 17:50 UTCEPSS rescore
  11. 2026-06-17 17:50 UTCEPSS rescore
  12. 2026-06-16 17:50 UTCEPSS rescore
  13. 2026-06-15 17:46 UTCEPSS rescore
  14. 2026-06-14 23:15 UTCEPSS rescore
  15. 2026-06-13 22:58 UTCEPSS rescore
  16. 2026-06-13 22:58 UTCEPSS rescore
  17. 2026-06-12 23:10 UTCEPSS rescore
  18. 2026-06-12 23:10 UTCEPSS rescore
  19. 2026-06-11 13:58 UTCEPSS rescore
  20. 2026-06-11 13:58 UTCEPSS rescore
  21. 2026-06-10 22:16 UTCEPSS rescore
  22. 2026-06-10 13:20 UTCEPSS rescore
  23. 2026-06-08 14:15 UTCEPSS rescore
  24. 2026-06-07 17:16 UTCOSV refresh
  25. 2026-06-07 15:23 UTCEPSS rescore
  26. 2026-06-07 15:23 UTCEPSS rescore
  27. 2026-06-06 13:46 UTCEPSS rescore
  28. 2026-06-06 13:46 UTCEPSS rescore
  29. 2026-06-06 13:46 UTCEPSS rescore
  30. 2026-06-05 22:45 UTCEPSS rescore
  31. 2026-06-05 22:45 UTCEPSS rescore
  32. 2026-06-05 06:08 UTCEPSS rescore
  33. 2026-06-05 06:08 UTCEPSS rescore
  34. 2026-06-04 13:10 UTCEPSS rescore
  35. 2026-06-04 13:10 UTCEPSS rescore
  36. 2026-06-02 20:11 UTCEPSS rescore
  37. 2026-06-02 20:11 UTCEPSS rescore
  38. 2026-06-01 13:50 UTCEPSS rescore
  39. 2026-05-31 22:29 UTCEPSS rescore
  40. 2026-05-31 22:29 UTCEPSS rescore
  41. 2026-05-31 00:15 UTCEPSS rescore
  42. 2026-05-31 00:15 UTCEPSS rescore
  43. 2026-05-29 13:42 UTCEPSS rescore
  44. 2026-05-28 13:43 UTCEPSS rescore
  45. 2026-05-28 13:43 UTCEPSS rescore
  46. 2026-05-27 13:39 UTCEPSS rescore
  47. 2026-05-27 13:39 UTCEPSS rescore
  48. 2026-05-26 13:42 UTCEPSS rescore
  49. 2026-05-26 13:42 UTCEPSS rescore
  50. 2026-05-26 07:17 UTCEPSS rescore
  51. 2026-05-26 07:17 UTCEPSS rescore
  52. 2026-05-23 07:49 UTCEG score recompute
  53. 2026-05-23 07:49 UTCVendor advisory

Frequently asked(5)

What is CVE-2020-8927?
CVE-2020-8927 is a medium vulnerability published on September 15, 2020. 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…
When was CVE-2020-8927 disclosed?
CVE-2020-8927 was first published in the National Vulnerability Database on September 15, 2020, with the most recent update on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-8927 actively exploited?
CVE-2020-8927 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-8927?
CVE-2020-8927 has a CVSS v4.0 base score of 5.3 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2020-8927?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8927, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-8927

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