CISA KEV High exploit reference

CVE-2006-1547 — Apache Struts 1 ActionForm Denial-of-Service Vulnerability

ActionForm in Apache Software Foundation (ASF) Struts before 1.2.9 with BeanUtils 1.7 allows remote attackers to cause a denial of service via a multipart/form-data encoded form with a parameter name that references the public getMultipartRequestHandler method, which provides further access to elements in the CommonsMultipartRequestHandler implementation and BeanUtils.

Published Mar 30, 2006 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database, GitHub Security Advisories · CNA: redhat

High

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Jan 21, 2022

How the score was calculated

Confirmed exploitation (CISA KEV)+35
EPSS 54.6% (30-day exploitation probability)+15
Technical severity (high)+6
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Confirmed

CISA KEV, listed Jan 21, 2022

EPSS FIRST

54.64%

ahead of 99% of scored CVEs · Oct 14, 2026

Affects

Apache Software Foundation

Struts and 1 more

CVSS base

7.5

High · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Active

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — struts.apache.org (NIST National Vulnerability Database)
Maven Struts:struts: fixed in version 1.2.9 — github.com (GitHub Security Advisories)

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: Jul 21, 2022 — passed 1547 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Apache Software Foundation Struts, Maven Struts:struts).
Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
EPSS ahead of 99% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Apache Software Foundation	Struts	< 1.2.9	Vulnerable	NIST National Vulnerability Database
Maven	Struts:struts	< 1.2.9	Vulnerable	GitHub Security Advisories

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.5	CVSS 3.1	High	3.9	3.6	nvd@nist.gov via NIST National Vulnerability Database
7.5	CVSS 3.1	High	3.9	3.6	134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
7.5	CVSS 3.1	High	—	—	GitHub, Inc. via GitHub Security Advisories
7.5	CVSS 3.1	High	—	—	CISA-ADP via CVE Program (cve.org) e CISA ADP
7.8	CVSS 2.0	High	10.0	6.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-749

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed

Jan 21, 2022

Federal deadline

Jul 21, 2022

passed 1547 day(s) ago

Ransomware use

Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 54.64%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Hunt retroactively in logs from before Jan 21, 2022 (KEV listing): exploitation may have started earlier.

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Fix documented
Oct 13, 2026 · GitHub Security Advisories
Affected products added · maven/struts:struts
Oct 13, 2026 · GitHub Security Advisories
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
Affected products added · apache/struts
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · Published → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record published
Oct 13, 2026
CVSS changed · 7.5
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Published
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Added to CISA KEV (detected)
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
Record created in this database
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
2022
Added to CISA KEV catalog
Jan 20, 2022 · CISA
2006
CVE published
Mar 30, 2006 · redhat

Source activity

Repeated readings are counted rather than listed.

3× References added · Oct 13, 2026 – Oct 13, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

12 on the record

struts.apache.org/struts-doc-1.2.9/userGuide/release-notes.html
x_refsource_CONFIRM, Broken Link, Exploit, Patch, Vendor Advisory, CVE Program (cve.org) e CISA ADP
www.cisa.gov/known-exploited-vulnerabilities-catalog
US Government Resource, NIST National Vulnerability Database
secunia.com/advisories/20117
third-party-advisory, x_refsource_SECUNIA, Broken Link, CVE Program (cve.org) e CISA ADP
issues.apache.org/bugzilla/show_bug.cgi
x_refsource_CONFIRM, Issue Tracking, Permissions Required, CVE Program (cve.org) e CISA ADP
www.securityfocus.com/bid/17342
vdb-entry, x_refsource_BID, Broken Link, Third Party Advisory, VDB Entry, CVE Program (cve.org) e CISA ADP
exchange.xforce.ibmcloud.com/vulnerabilities/25613
vdb-entry, x_refsource_XF, Third Party Advisory, VDB Entry, CVE Program (cve.org) e CISA ADP
www.vupen.com/english/advisories/2006/1205
vdb-entry, x_refsource_VUPEN, Broken Link, CVE Program (cve.org) e CISA ADP
lists.suse.com/archive/suse-security-announce/2006-May/0004.html
vendor-advisory, x_refsource_SUSE, Broken Link, CVE Program (cve.org) e CISA ADP
securitytracker.com/id
vdb-entry, x_refsource_SECTRACK, Broken Link, Third Party Advisory, VDB Entry, CVE Program (cve.org) e CISA ADP
github.com/advisories/GHSA-7qwv-cwgj-c8rj
GitHub Security Advisories
secunia.com/advisories/19493
third-party-advisory, x_refsource_SECUNIA, Broken Link, CVE Program (cve.org) e CISA ADP
nvd.nist.gov/vuln/detail/CVE-2006-1547
GitHub Security Advisories

Elsewhere on this site

Apache Software Foundation
every CVE for this vendor

2022-01
what else CISA listed that month

CWE-749
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-104713 Apache Struts: Unbounded request body read in the REST plugin 10d
High CVE-2026-104712 Apache Struts: Disproportionate response size when rendering BigDecimal request parameters 10d
Critical CVE-2026-104711 Apache Struts: OGNL injection in the legacy RESTful action mapper 10d
High CVE-2026-104714 Apache Struts: Shared message formatter exposes date and time values across concurrent requests 10d
High CVE-2025-68493 Apache Struts, Apache Struts: XXE vulnerability in outdated XWork component Jan 11, 2026
High CVE-2025-66675 Apache Struts: File leak in multipart request processing causes disk exhaustion (DoS) - version ranges fixed Dec 10, 2025

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2006-1547 is "Apache Struts 1 ActionForm Denial-of-Service Vulnerability", rated High. It affects Struts (Apache Software Foundation); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 7.5 describes technical severity. EPSS 54.64% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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