CVE-2024-11603: A Server-Side Request Forgery (SSRF) vulnerability exists in lm-sys/fastchat version 0.2.36

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2024-11603 is a high-severity flaw (CVSS 7.5) affecting fastchat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Server-Side Request Forgery (SSRF) vulnerability exists in lm-sys/fastchat version 0.2.36. The vulnerability is present in the `/queue/join?` endpoint, where insufficient validation of the path parameter allows an attacker to send crafted requests. This can lead to unauthorized access to internal networks or the AWS metadata endpoint, potentially exposing sensitive data and compromising internal servers.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-918
Published	2025-03-20
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: lm-sys

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-20 10:15 UTCPublished CVE record published
2026-06-17 06:58 UTCUpdated Record last modified

lm-sys fastchat DOWNGRADE

Affected: 0.2.36

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.36

1. Check installed version

apt-cache policy fastchat || rpm -q fastchat || fastchat --version

2. No fixed release: DOWNGRADE to a release before 0.2.36 (Debian / Ubuntu)

apt-cache madison fastchat sudo apt install fastchat=<VERSION_BEFORE_0.2.36> sudo apt-mark hold fastchat

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fastchat sudo dnf downgrade fastchat-<VERSION_BEFORE_0.2.36> sudo dnf versionlock add fastchat

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-11603?

fastchat: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-11603 being exploited?

CVE-2024-11603 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-11603 affect?

CVE-2024-11603 affects fastchat. Severity is high (CVSS 7.5). A Server-Side Request Forgery (SSRF) vulnerability exists in lm-sys/fastchat version 0.2.36. The vulnerability is present in the `/queue/join?` endpoint, where insufficient validation of the path parameter allows an attacker to send crafted

How urgent is CVE-2024-11603?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

AWS vulnerabilities

Related CVEs

CVE-2024-12376 HIGH 7.5 DOWNGRADE A Server-Side Request Forgery (SSRF) vulnerability was identified in the lm-sys/fastchat web server, specifica
CVE-2024-10912 HIGH 7.5 DOWNGRADE A Denial of Service (DoS) vulnerability exists in the file upload feature of lm-sys/fastchat version 0.2.36
CVE-2024-10908 MEDIUM 6.1 DOWNGRADE An open redirect vulnerability in lm-sys/fastchat Release v0.2.36 allows a remote unauthenticated attacker to
CVE-2024-10907 HIGH 7.5 DOWNGRADE In lm-sys/fastchat Release v0.2.36, the server fails to handle excessive characters appended to the end of mul
CVE-2024-10044 CRITICAL 9.3 DOWNGRADE A Server-Side Request Forgery (SSRF) vulnerability exists in the POST /worker_generate_stream API endpoint of

References

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