CVE-2007-4556

Name: CVE-2007-4556
Creator: NVD / NIST
Published: 2007-08-28T01:17:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 25.75%

Last modified Jun 16, 2026

CVE-2007-4556 is a vulnerability of currently unknown severity. Struts support in OpenSymphony XWork before 1.2.3, and 2.x before 2.0.4, as used in WebWork and Apache Struts, recursively evaluates all input as an Object-Graph Navigation Language (OGNL) expression when altSyntax is enabled, which allows remote attackers to cause a denial of service (infinite loop) or execute arbitrary code via form input beginning with a "%{" sequence and ending with a "}" character.. EPSS estimates a 25.75% chance of exploitation in the next 30 days.

Description

Struts support in OpenSymphony XWork before 1.2.3, and 2.x before 2.0.4, as used in WebWork and Apache Struts, recursively evaluates all input as an Object-Graph Navigation Language (OGNL) expression when altSyntax is enabled, which allows remote attackers to cause a denial of service (infinite loop) or execute arbitrary code via form input beginning with a "%{" sequence and ending with a "}" character.

Metrics

EPSS Probability

25.75%

97.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Opensymphony	Xwork	< 1.2.3
Opensymphony	Xwork	>= 2.0.0, <= 2.0.4

References

http://forums.opensymphony.com/ann.jspa?annID=54Patch, Vendor Advisory
http://issues.apache.org/struts/browse/WW-2030Third Party Advisory
http://jira.opensymphony.com/browse/XW-544Vendor Advisory
http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21701Vendor Advisory
http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21706Vendor Advisory
http://osvdb.org/37072Broken Link
http://secunia.com/advisories/26681Third Party Advisory
http://secunia.com/advisories/26693Third Party Advisory
http://secunia.com/advisories/26694Third Party Advisory
http://struts.apache.org/2.x/docs/s2-001.htmlPatch, Third Party Advisory
http://wiki.opensymphony.com/display/WW/1.2.3+Press+ReleaseVendor Advisory
http://www.securityfocus.com/bid/25524Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2007/3041Third Party Advisory
http://www.vupen.com/english/advisories/2007/3042Third Party Advisory
http://forums.opensymphony.com/ann.jspa?annID=54Patch, Vendor Advisory
http://issues.apache.org/struts/browse/WW-2030Third Party Advisory
http://jira.opensymphony.com/browse/XW-544Vendor Advisory
http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21701Vendor Advisory
http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21706Vendor Advisory
http://osvdb.org/37072Broken Link
http://secunia.com/advisories/26681Third Party Advisory
http://secunia.com/advisories/26693Third Party Advisory
http://secunia.com/advisories/26694Third Party Advisory
http://struts.apache.org/2.x/docs/s2-001.htmlPatch, Third Party Advisory
http://wiki.opensymphony.com/display/WW/1.2.3+Press+ReleaseVendor Advisory
http://www.securityfocus.com/bid/25524Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2007/3041Third Party Advisory
http://www.vupen.com/english/advisories/2007/3042Third Party Advisory

Timeline

Published: Aug 28, 2007
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2007-4556?

How severe is CVE-2007-4556?

Severity scoring for CVE-2007-4556 is pending analysis. The EPSS model estimates a 25.75% probability of exploitation in the next 30 days.

How do I fix CVE-2007-4556?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2007-4556?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST