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CVE-2024-39573

Apache HTTP Server: mod_rewrite proxy handler substitution

Public exploit available. Not confirmed exploited in the wild yet. A vendor fix is available.

CVSS 3.17.5HighEPSS percentile98th35% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
Public exploit: 1 sourceFixVendor fixNo build named by the sources
Check it yourself

OpenVAS · 51 checks

e.g. OID 1.3.6.1.4.1.25623.1.0.114682

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Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

The vendor has published a fix. Version details are below where the sources state them.

  • Apache Software Foundation Apache HTTP ServerAffected: ≥ 2.4.0, ≤ 2.4.59Upgrade to: after 2.4.59Stated by: CVE record
  • ООО «РусБИТех-Астра» Astra Linux Special EditionAffected: 1.6 «Смоленск»Upgrade to: not statedStated by: BDU
  • Red Hat Inc. Red Hat Enterprise LinuxAffected: 8Upgrade to: not statedStated by: BDU
  • Novell Inc. Suse Linux Enterprise ServerAffected: 12 SP5Upgrade to: not statedStated by: BDU
  • Novell Inc. SUSE Linux Enterprise Software Development KitAffected: 12 SP5Upgrade to: not statedStated by: BDU

Versions as the sources state them. 12 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to cause unsafe RewriteRules to unexpectedly setup URL's to be handled by mod_proxy. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS98th
Public exploit
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

1 source with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

35% chance of exploitation activity in the next 30 days, which ranks it in the 98th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

The patch came 123 days before any public exploit.

  1. OpenVAS check added
  2. EPSS band changelow → moderate
  3. Public exploit / PoCsource: github-poc
  4. Patch availablerecord updated
  5. Publishedweakness classified, att&ck mapped

Affected products

And 10 more affected products. See all after sign-in

Scale

How widely the affected products are used. This is not a count of vulnerable hosts.

Estimate Public sources, each figure dated. How much of it is already patched is not known.

Apache HTTP Server

Web

  • 21%of websites

    Among websites whose web server we know.

    W3Techs ↗ · as of 2 Nov 2026 · Medium confidence

Version split · W3Techs · as of 2 Nov 2026

  • 2.495%
  • 2.25.1%
  • 1<1%
  • 2.0<1%

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Scored 7.5 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity NoneNo integrity impact
  • Availability NoneNo availability impact

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 16 more references. See all after sign-in

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