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NVD / CVE Program· CNA GitHub_M

CVE-2025-47947: ModSecurity Has Possible DoS Vulnerability

Noroxi assessment

Priority: Monitor (action score 30/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.59% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: mod_security (AlmaLinux:8) 2.9.6-2.el8_10; mod_security-mlogc (AlmaLinux:8) 2.9.6-2.el8_10; mod_security (AlmaLinux:9) 2.9.6-2.el9_6.

Low priority for now. Upgrade to mod_security (AlmaLinux:8) 2.9.6-2.el8_10; mod_security-mlogc (AlmaLinux:8) 2.9.6-2.el8_10; mod_security (AlmaLinux:9) 2.9.6-2.el9_6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions up to and including 2.9.8 are vulnerable to denial of service in one special case (in stable released versions): when the payload's content type is `application/json`, and there is at least one rule which does a `sanitiseMatchedBytes` action. A patch is available at pull request 3389 and expected to be part of version 2.9.9. No known workarounds are available.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
May 21, 2025
Updated
Jun 17, 2026
EPSS
0.5% · 49th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
trustwavemodsecurity

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • trustwave modsecuritybefore 2.9.9

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • owasp-modsecurity ModSecurity

    • <= 2.9.8affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8mod_securitybefore 2.9.6-2.el8_102.9.6-2.el8_10
AlmaLinux:8mod_security-mlogcbefore 2.9.6-2.el8_102.9.6-2.el8_10
AlmaLinux:9mod_securitybefore 2.9.6-2.el9_62.9.6-2.el9_6
AlmaLinux:9mod_security-mlogcbefore 2.9.6-2.el9_62.9.6-2.el9_6
Debian:11modsecurity-apachebefore 2.9.3-3+deb11u32.9.3-3+deb11u3
Debian:12modsecurity-apachebefore 2.9.7-1+deb12u12.9.7-1+deb12u1
Debian:13modsecurity-apachebefore 2.9.9-12.9.9-1
openSUSE:Leap 15.6apache2-mod_security2before 2.9.4-150400.3.9.12.9.4-150400.3.9.1
openSUSE:Tumbleweedapache2-mod_security2before 2.9.10-1.12.9.10-1.1
Red Hat:enterprise_linux:8::appstreammod_securitybefore 0:2.9.6-2.el8_100:2.9.6-2.el8_10
Red Hat:enterprise_linux:8::appstreammod_security-debuginfobefore 0:2.9.6-2.el8_100:2.9.6-2.el8_10
Red Hat:enterprise_linux:8::appstreammod_security-debugsourcebefore 0:2.9.6-2.el8_100:2.9.6-2.el8_10
Red Hat:enterprise_linux:8::appstreammod_security-mlogcbefore 0:2.9.6-2.el8_100:2.9.6-2.el8_10
Red Hat:enterprise_linux:8::appstreammod_security-mlogc-debuginfobefore 0:2.9.6-2.el8_100:2.9.6-2.el8_10
Red Hat:enterprise_linux:9::appstreammod_securitybefore 0:2.9.6-2.el9_60:2.9.6-2.el9_6
Red Hat:enterprise_linux:9::appstreammod_security-debuginfobefore 0:2.9.6-2.el9_60:2.9.6-2.el9_6
Red Hat:enterprise_linux:9::appstreammod_security-debugsourcebefore 0:2.9.6-2.el9_60:2.9.6-2.el9_6
Red Hat:enterprise_linux:9::appstreammod_security-mlogcbefore 0:2.9.6-2.el9_60:2.9.6-2.el9_6
Red Hat:enterprise_linux:9::appstreammod_security-mlogc-debuginfobefore 0:2.9.6-2.el9_60:2.9.6-2.el9_6
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpdbefore 0:2.4.62-8.el7jbcs0:2.4.62-8.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-debuginfobefore 0:2.4.62-8.el7jbcs0:2.4.62-8.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-develbefore 0:2.4.62-8.el7jbcs0:2.4.62-8.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-manualbefore 0:2.4.62-8.el7jbcs0:2.4.62-8.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-selinuxbefore 0:2.4.62-8.el7jbcs0:2.4.62-8.el7jbcs

+82

Same product

trustwave: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-27110Libmodsecurity3 has possible bypass of encoded HTML entities
    31Monitor
  • CVE-2013-1915ModSecurity before 2.7.3 allows remote attackers to read arbitrary files, send HTTP requests to intranet servers, or cause a denial of…
    31Monitor
  • CVE-2024-46292A buffer overflow in modsecurity v3.0.12 allows attackers to cause a Denial of Service (DoS) via a crafted input inserted into the name…
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2012-4528Dec 28, 2012 · The mod_security2 module before 2.7.0 for the Apache HTTP Server allows remote attackers to bypass rules, and deliver arbitrary POST data…
    24Monitor
  • ← EarlierCVE-2013-5705Apr 15, 2014 · apache2/modsecurity.c in ModSecurity before 2.7.6 allows remote attackers to bypass rules by using chunked transfer coding with a…
    21Monitor
  • ← EarlierCVE-2023-24021Jan 20, 2023 · Incorrect handling of '\0' bytes in file uploads in ModSecurity before 2.9.7 may allow for Web Application Firewall bypasses and buffer…
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:mod_security2.9.6-2.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:mod_security-mlogc2.9.6-2.el9_6 · AlmaLinux:9Package registry (OSV)
debian:modsecurity-apache2.9.7-1+deb12u1 · Debian:12Package registry (OSV)
opensuse:apache2-mod_security22.9.4-150400.3.9.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:jbcs-httpd24-httpd0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-debuginfo0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-devel0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-manual0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-selinux0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-tools0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_http20:2.0.29-5.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_http2-debuginfo0:2.0.29-5.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_jk0:1.2.50-9.redhat_1.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_jk-ap240:1.2.50-9.redhat_1.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_jk-debuginfo0:1.2.50-9.redhat_1.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_ldap0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
rocky linux:mod_security0:2.9.6-2.el9_6 · Rocky Linux:9Package registry (OSV)
suse:apache2-mod_security22.9.4-150400.3.9.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP6Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02026-10-01

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+497 d
  3. TodayNov 11, 2026+538 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-1050 · Excessive Platform Resource Consumption within a Loop

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturitynone → poc
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records