CVE-2011-4858
MediumPublic exploitImproper Input Validation in Apache Tomcat
Published May 14, 2022 · Updated Mar 9, 2026 · Also known as GHSA-wr3m-gw98-mc3j
Key Facts
Patch immediately- CVE-2011-4858 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Tomcat (Apache), tomcat6 (debian), org.apache.tomcat:tomcat (maven) and 20 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 80% probability of exploitation in the next 30 days.
- Fixed versions are available, including jbossweb 0:2.1.12-3_patch_03.2.ep5.el4, jbossweb 0:2.1.12-3_patch_03.2.ep5.el5, jbossweb 0:2.1.12-3_patch_03.2.ep5.el6.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS (30-day exploit likelihood)
80%
Higher than 99.6% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2011-4858 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Apache Tomcat before 5.5.35, 6.x before 6.0.35, and 7.x before 7.0.23 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.
Affected Products
88 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| TomcatApache | 5.5.35, 6.0.0, 6.0.1, 6.0.10, 6.0.11, 6.0.12, 6.0.13, 6.0.14 | n/a |
| tomcat6debian | See advisory | 6.0.35-1+squeeze2 |
| org.apache.tomcat:tomcatmaven | >= 5.5.0 | 7.0.23 |
| tomcat5-admin-webappsoracle | See advisory | 5.5.23-0jpp.31.el5_8 |
| tomcat5-common-liboracle | See advisory | 5.5.23-0jpp.31.el5_8 |
Patched Releases
jbossweb
0:2.1.12-3_patch_03.2.ep5.el4, 0:2.1.12-3_patch_03.2.ep5.el5, 0:2.1.12-3_patch_03.2.ep5.el6
org.apache.tomcat:tomcat
5.5.35, 6.0.35, 7.0.23
tomcat5
0:5.5.23-0jpp.31.el5_8, 0:5.5.33-28_patch_07.ep5.el6, 5.5.23-0jpp.31.el5_8
tomcat5-admin-webapps
5.5.23-0jpp.31.el5_8
tomcat5-common-lib
5.5.23-0jpp.31.el5_8
tomcat5-jasper
5.5.23-0jpp.31.el5_8
tomcat5-jasper-javadoc
5.5.23-0jpp.31.el5_8
tomcat5-jsp-2.0-api
5.5.23-0jpp.31.el5_8
tomcat5-jsp-2.0-api-javadoc
5.5.23-0jpp.31.el5_8
tomcat5-server-lib
5.5.23-0jpp.31.el5_8
tomcat5-servlet-2.4-api
5.5.23-0jpp.31.el5_8
tomcat5-servlet-2.4-api-javadoc
5.5.23-0jpp.31.el5_8
tomcat5-webapps
5.5.23-0jpp.31.el5_8
tomcat6
0:6.0.32-24_patch_07.ep5.el5, 0:6.0.32-24_patch_07.ep5.el6, 6.0.24-36.el6_2, 6.0.35-1+squeeze2
tomcat6-admin-webapps
6.0.24-36.el6_2
tomcat6-docs-webapp
6.0.24-36.el6_2
tomcat6-el-2.1-api
6.0.24-36.el6_2
tomcat6-javadoc
6.0.24-36.el6_2
tomcat6-jsp-2.1-api
6.0.24-36.el6_2
tomcat6-lib
6.0.24-36.el6_2
tomcat6-servlet-2.5-api
6.0.24-36.el6_2
tomcat6-webapps
6.0.24-36.el6_2
Timeline
Publicly disclosed
May 14, 2022
Last updated
Mar 9, 2026
Weakness Type
- CWE-20 Improper Input Validation
- CWE-399
References
- advisoryRHSA-2012:0041
- advisoryRHSA-2012:0074
- advisoryRHSA-2012:0075
- advisoryRHSA-2012:0076
- advisoryRHSA-2012:0077
FAQ
Common Questions.
Apache Tomcat before 5.5.35, 6.x before 6.0.35, and 7.x before 7.0.23 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.
Affected: Tomcat (Apache) versions 5.5.35, 6.0.0, 6.0.1, 6.0.10, 6.0.11, 6.0.12, 6.0.13, 6.0.14; tomcat6 (debian); org.apache.tomcat:tomcat (maven) versions >= 5.5.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including jbossweb 0:2.1.12-3_patch_03.2.ep5.el4, jbossweb 0:2.1.12-3_patch_03.2.ep5.el5, jbossweb 0:2.1.12-3_patch_03.2.ep5.el6.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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