CVE-2007-4556
MEDIUMEPSS 98th pctlDescription
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.
CVSS v2 Vector
No CVSS vector data available.
Exploit Intelligence
Very high risk: more likely to be exploited than 98% of all known CVEs.
References
- http://forums.opensymphony.com/ann.jspa?annID=54
- http://issues.apache.org/struts/browse/WW-2030
- http://jira.opensymphony.com/browse/XW-544
- http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21701
- http://jira.opensymphony.com/secure/ReleaseNote.jspa?projectId=10050&styleName=Html&version=21706
- http://osvdb.org/37072
- http://secunia.com/advisories/26681
- http://secunia.com/advisories/26693
- http://secunia.com/advisories/26694
- http://struts.apache.org/2.x/docs/s2-001.html
- http://wiki.opensymphony.com/display/WW/1.2.3+Press+Release
- http://www.securityfocus.com/bid/25524
- http://www.vupen.com/english/advisories/2007/3041
- http://www.vupen.com/english/advisories/2007/3042
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Start freeThis product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.