CVE-2021-32677

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 48% of all CVEs by exploit prediction. 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: epss, nvd
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack. In versions lower than 0.65.2, FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application. This is fixed in FastAPI 0.65.2. The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

June 9, 2021

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 8, 2026
Patch available. Sources: github_commit, github.
generic

[SECURITY] Fedora 34 Update: python-fastapi-0.65.2-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MATAWX25TYKNEKLDMKWNLYDB34UWTROA/
github Patch Available

Cross-Site Request Forgery (CSRF) in FastAPI · Advisory · fastapi/fastapi · GitHub

https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7
github_commit Patch Available

commit fa7e3c996edf (tiangolo/fastapi)

Patch available: tiangolo/fastapi 0.135.4 (contains commit fa7e3c996edf)

https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
fastapi0.100.0-1 ... 0.92.0-1 (28 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
fastapi—0.70.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
fastapi—0.70.0-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
fastapi—0.70.0-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
fastapi0.1.0 ... 0.9.1 (116 versions)0.65.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 33× 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.

Showing the most recent 100 of 166 total refreshes for this CVE.

  1. 2026-09-19 15:38 UTCEPSS rescore
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:23 UTCEPSS rescore
  4. 2026-09-17 19:23 UTCEPSS rescore
  5. 2026-09-16 14:05 UTCEPSS rescore
  6. 2026-09-16 14:05 UTCEPSS rescore
  7. 2026-09-15 03:06 UTCEPSS rescore
  8. 2026-09-13 16:43 UTCEPSS rescore
  9. 2026-09-12 14:57 UTCEPSS rescore
  10. 2026-09-11 14:49 UTCEPSS rescore
  11. 2026-09-11 09:33 UTCEPSS rescore
  12. 2026-09-08 21:56 UTCEPSS rescore
  13. 2026-09-07 15:58 UTCEPSS rescore
  14. 2026-09-06 16:01 UTCOSV refresh
  15. 2026-09-06 13:45 UTCEPSS rescore
  16. 2026-09-06 13:45 UTCEPSS rescore
  17. 2026-09-05 15:25 UTCEPSS rescore
  18. 2026-09-04 13:57 UTCEPSS rescore
  19. 2026-09-04 05:03 UTCEPSS rescore
  20. 2026-09-02 14:08 UTCEPSS rescore
  21. 2026-09-01 13:50 UTCEPSS rescore
  22. 2026-09-01 03:32 UTCEPSS rescore
  23. 2026-08-30 19:14 UTCEPSS rescore
  24. 2026-08-30 01:19 UTCEPSS rescore
  25. 2026-08-30 01:19 UTCEPSS rescore
Show 75 more
  1. 2026-08-28 21:37 UTCEPSS rescore
  2. 2026-08-27 14:22 UTCEPSS rescore
  3. 2026-08-26 14:42 UTCEPSS rescore
  4. 2026-08-25 13:46 UTCEPSS rescore
  5. 2026-08-24 14:13 UTCEPSS rescore
  6. 2026-08-23 00:16 UTCEPSS rescore
  7. 2026-08-21 23:46 UTCEPSS rescore
  8. 2026-08-20 22:52 UTCEPSS rescore
  9. 2026-08-20 01:45 UTCOSV refresh
  10. 2026-08-19 17:01 UTCEPSS rescore
  11. 2026-08-18 13:45 UTCEPSS rescore
  12. 2026-08-17 13:44 UTCEPSS rescore
  13. 2026-08-16 14:53 UTCEPSS rescore
  14. 2026-08-16 02:11 UTCEPSS rescore
  15. 2026-08-16 02:11 UTCEPSS rescore
  16. 2026-08-15 01:27 UTCEPSS rescore
  17. 2026-08-13 21:57 UTCEPSS rescore
  18. 2026-08-12 13:48 UTCEPSS rescore
  19. 2026-08-11 13:38 UTCEPSS rescore
  20. 2026-08-09 13:44 UTCEPSS rescore
  21. 2026-08-08 16:33 UTCEPSS rescore
  22. 2026-08-07 16:24 UTCEPSS rescore
  23. 2026-08-06 13:43 UTCEPSS rescore
  24. 2026-08-05 19:14 UTCEPSS rescore
  25. 2026-08-04 20:48 UTCOSV refresh
  26. 2026-08-04 15:06 UTCEPSS rescore
  27. 2026-08-04 10:34 UTCEPSS rescore
  28. 2026-08-03 10:33 UTCEPSS rescore
  29. 2026-08-02 02:24 UTCEPSS rescore
  30. 2026-08-02 02:24 UTCEPSS rescore
  31. 2026-08-01 04:13 UTCEPSS rescore
  32. 2026-07-30 16:25 UTCEPSS rescore
  33. 2026-07-30 01:28 UTCEPSS rescore
  34. 2026-07-28 15:33 UTCEPSS rescore
  35. 2026-07-26 14:52 UTCEPSS rescore
  36. 2026-07-26 14:52 UTCEPSS rescore
  37. 2026-07-25 14:15 UTCEPSS rescore
  38. 2026-07-24 14:15 UTCEPSS rescore
  39. 2026-07-23 14:16 UTCEPSS rescore
  40. 2026-07-23 14:16 UTCEPSS rescore
  41. 2026-07-23 02:00 UTCEG score recompute
  42. 2026-07-22 22:48 UTCEG score recompute
  43. 2026-07-22 14:06 UTCEPSS rescore
  44. 2026-07-22 14:06 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-21 15:22 UTCEPSS rescore
  47. 2026-07-20 17:05 UTCEPSS rescore
  48. 2026-07-19 14:29 UTCEPSS rescore
  49. 2026-07-19 14:29 UTCEPSS rescore
  50. 2026-07-19 02:27 UTCEPSS rescore
  51. 2026-07-18 18:59 UTCOSV refresh
  52. 2026-07-18 10:02 UTCEPSS rescore
  53. 2026-07-18 10:02 UTCEPSS rescore
  54. 2026-07-16 17:00 UTCEPSS rescore
  55. 2026-07-16 17:00 UTCEPSS rescore
  56. 2026-07-15 16:55 UTCEPSS rescore
  57. 2026-07-15 01:58 UTCEPSS rescore
  58. 2026-07-13 22:27 UTCEPSS rescore
  59. 2026-07-13 06:10 UTCEPSS rescore
  60. 2026-07-12 05:44 UTCEPSS rescore
  61. 2026-07-12 05:44 UTCEPSS rescore
  62. 2026-07-11 08:25 UTCEPSS rescore
  63. 2026-07-11 08:25 UTCEPSS rescore
  64. 2026-07-09 19:07 UTCEPSS rescore
  65. 2026-07-08 15:12 UTCEPSS rescore
  66. 2026-07-07 13:43 UTCEPSS rescore
  67. 2026-07-06 16:25 UTCEPSS rescore
  68. 2026-07-06 02:21 UTCEPSS rescore
  69. 2026-07-05 02:28 UTCEPSS rescore
  70. 2026-07-05 02:28 UTCEPSS rescore
  71. 2026-07-04 06:29 UTCEPSS rescore
  72. 2026-07-04 06:29 UTCEPSS rescore
  73. 2026-07-01 15:04 UTCEPSS rescore
  74. 2026-07-01 01:48 UTCOSV refresh
  75. 2026-06-30 23:20 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-32677?
CVE-2021-32677 is a high vulnerability published on June 9, 2021. FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack.…
When was CVE-2021-32677 disclosed?
CVE-2021-32677 was first published in the National Vulnerability Database on June 9, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-32677 actively exploited?
CVE-2021-32677 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 45.6% of all scored CVEs.
What is the CVSS score of CVE-2021-32677?
CVE-2021-32677 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2021-32677?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32677, 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-2021-32677

Explore →

Is Your Infrastructure Affected by CVE-2021-32677?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs