CVE-2025-57816Network attack vector

Service interruption via misattributed in-memory rate limits

Published Sep 8, 2025 · Updated Sep 9, 2025

Improper rate limiting in Fides before 2.69.1 allows remote attackers to interrupt API service through unauthenticated requests. The Webserver API keys request counters to directly connected proxy addresses and keeps those counters in each process instead of a shared store. Exploitation requires a proxied deployment that relies on the built-in limiter; attackers can exhaust resources or force legitimate clients to receive HTTP 429 responses.

CVSS severity6.3
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper rate limiting in Fides before 2.69.1 allows remote attackers to interrupt API service through unauthenticated requests. The Webserver API keys request counters to directly connected proxy addresses and keeps those counters in each process instead of a shared store. Exploitation requires a proxied deployment that relies on the built-in limiter; attackers can exhaust resources or force legitimate clients to receive HTTP 429 responses.

The record

CVE
CVE-2025-57816
Published
Sep 8, 2025
Updated
Sep 9, 2025
Vendor
Ethyca
Product
Fides
Classifications
CWE-799, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.69.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ethyca · Fidesversion=< 2.69.1

Published CVSS scores

6.3GitHub Security AdvisoryCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-799Improper Control of Interaction Frequency
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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