CVE-2025-57816 Fides Webserver API Rate Limiting Vulnerability in Proxied Environments
Attackers can bypass IP-based rate limits in proxied environments, potentially causing denial of service against the Fides Webserver API.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-57816?
CVE-2025-57816 is a medium-severity vulnerability in ethyca fides, published on 8 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Fides is an open-source privacy engineering platform. Prior to version 2.69.1, the Fides Webserver API's built-in IP-based rate limiting is ineffective in environments with CDNs, proxies or load balancers. The system incorrectly applies rate limits based on directly connected infrastructure IPs rather than client IPs, and stores counters in-memory rather than in a shared store. This allows attackers to bypass intended rate limits and potentially cause denial of service. This vulnerability only affects deployments relying on Fides's built-in rate limiting for protection. Deployments using external rate limiting solutions (WAFs, API gateways, etc.) are not affected. Version 2.69.1 fixes the issue. There are no application-level workarounds. However, rate limiting may instead be implemented externally at the infrastructure level using a WAF, API Gateway, or similar technology.
Weakness: CWE-799
Which versions are affected by CVE-2025-57816?
3 open source packages ship an affected version, including ethyca-fides. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
ethyca-fides PyPI | All versions | 2.69.1 |
ethyca-fides PyPI | All versions | 2.69.1 |
ethyca-fides PyPI | All versions | 2.69.1 |
Products include Ethyca Fides.
How do I fix CVE-2025-57816?
Upgrade ethyca-fides to 2.69.1 or later.
Is CVE-2025-57816 being exploited?
There is no known exploitation of CVE-2025-57816 in the wild and no public exploit code.
Other vulnerabilities in ethyca fides
- CVE-2024-45053 Remote Code Execution Vulnerability via SSTI in Fides Webserver Jinja Email Templating Engine
- CVE-2023-41319 Remote Code Execution in Custom Integration Upload in Fides
- CVE-2025-57817 Fides Webserver API is Vulnerable to OAuth Client Privilege Escalation
- CVE-2023-48224 Cryptographically Weak Generation of One-Time Codes for Identity Verification in ethyca-fides
- CVE-2023-46124 Server-Side Request Forgery Vulnerability in Custom Integration Upload
Sources
Also known as GHSA-fq34-xw6c-fphf, PYSEC-2026-1341.