⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● Critical · CVSS 9.8 ⚠ ACTIVELY EXPLOITED — CISA KEV

How to Fix CVE-2024-23692: Server-Side Template Injection in HTTP File Server

Other vulnerabilities in the same area that are worth patching alongside this one:

*By Sai Kiran Pandrala*

⚡ At a glance
SeverityCVSS 9.8 - Critical
Actively exploited?Yes, listed in CISA KEV (added 2024-07-09)
Affected0 <= 2.3m
Fixed inSee vendor advisory
Type (CWE)CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
Patch immediately. CISA's KEV listing means active exploitation is confirmed. Federal agencies must remediate by 2024-07-30.

What is CVE-2024-23692?

CVE-2024-23692 is a server-side template injection flaw in HTTP File Server. User input is rendered as part of a template expression, which the engine then evaluates, giving the attacker code execution. Vendor description: Rejetto HTTP File Server, up to and including version 2.3m, is vulnerable to a template injection vulnerability. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary commands on the affected system by sending a specially crafted HTTP request.

Why this CVE matters

Server-side template injection is one of the cleanest paths from web request to code execution. The vulnerable parameter is usually attacker-controlled by design, which means proof-of-concept payloads are short and reliable.

For deployments of HTTP File Server that have been exposed to the public internet during the disclosure window, the operating assumption should be that scanning has already happened. Confirmed in-the-wild exploitation makes that assumption mandatory, not cautious. Patching closes the door; log review and credential rotation close out the rest of the response.

Am I affected?

You are affected if your installation matches any of these version ranges:

Check your installed version against the list above. If you cannot determine the version, treat the system as affected and follow the upgrade path below.

Open HTTP File Server's About dialog or run the vendor-documented version-check command. Compare the result against the affected ranges in the advisory.

How to fix CVE-2024-23692

  1. Read the vendor advisory in full: https://vulncheck.com/advisories/rejetto-unauth-rce
  2. Upgrade HTTP File Server to the patched build listed in the vendor advisory.
  3. Back up the configuration (and database, where applicable) before upgrading.
  4. Apply the patch in a maintenance window. For HA pairs, upgrade the standby node first, fail over, then upgrade the former primary.
  5. Restart the affected service so the patched binary loads, then verify the new version (see verification section).

Patch via your OS package manager


# The exact package name and patched version are listed in the vendor advisory:
# https://vulncheck.com/advisories/rejetto-unauth-rce
# Debian / Ubuntu
sudo apt update
sudo apt install --only-upgrade httpfileserver

# RHEL / Rocky / AlmaLinux / Fedora
sudo dnf upgrade httpfileserver

# openSUSE
sudo zypper update httpfileserver

# Verify the running version matches the fixed version
dpkg -s httpfileserver 2>/dev/null | grep -i version || rpm -q httpfileserver 2>/dev/null


# Windows: pull the cumulative update that ships this fix.
Install-Module PSWindowsUpdate -Force -SkipPublisherCheck
Get-WindowsUpdate -AcceptAll -Install -AutoReboot

Verify the fix landed


# 1. Confirm the running version matches the fixed-in version from the advisory:
#    https://vulncheck.com/advisories/rejetto-unauth-rce
#    Use the platform-specific version probe above.

# 2. Re-scan with your vulnerability scanner (Nessus, Qualys, Tenable, OpenVAS).
#    The scanner should no longer flag CVE-2024-23692 on the patched target.

# 3. Inspect recent service / kernel logs for crash loops or rollback events.
journalctl -u <service> --since "10 minutes ago"
dmesg --since "10 minutes ago"

If you cannot patch immediately

Block the affected endpoint or input from untrusted users. There is no configuration-only mitigation; patch is required.

How to verify the fix worked

If your installation was internet-reachable during the disclosure window, treat log review as part of the remediation rather than an optional follow-up. Look for unexpected administrator accounts in HTTP File Server, scheduled tasks or cron jobs you did not create, new files in web-accessible directories, and outbound connections to addresses not in your baseline. Suspicious requests to the vulnerable endpoint immediately followed by successful 200-class responses with unusually large bodies are a strong indicator of exploitation. Because HTTP File Server sits on CISA's Known Exploited Vulnerabilities catalog for this CVE, defenders should also pull the IOC list from the vendor advisory and from CISA's analysis if one was published.

Frequently asked questions

Is CVE-2024-23692 being exploited in the wild?

Yes. CISA added CVE-2024-23692 to the Known Exploited Vulnerabilities catalog, which means active exploitation has been confirmed by federal observation or credible vendor reporting.

Will a WAF or IDS rule fully mitigate CVE-2024-23692?

No. Network-layer filters can reduce noise and slow opportunistic scanners, but they will not stop a determined attacker. The vendor patch is the only durable fix.

How long should I plan for the upgrade?

Typical vendor-documented upgrade windows for HTTP File Server run from a few minutes to under an hour depending on cluster size. Test in a staging environment first and follow the vendor's documented HA upgrade order.

References

*This guide was assembled from the official vendor advisory, the NVD record, and the CISA KEV catalog entry on 2026-05-25. Always confirm against the vendor advisory before applying changes in production.*