CVE-2011-4858

mediumpriority · attend · 58EPSS 0.797 · 100 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · functional

Likely / severe?

79.7% (100th) EPSS

CVSS 5 · medium

Is it mine?

63 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.0

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:P/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-399USprimaryCWE-20US

exploits (2)

Public proof-of-concept and weaponised exploit code.

EDB-2012MyBulletinBoard (MyBB) 1.1.5 - 'CLIENT-IP' SQL Injectionfunctional · exploit_db
auxiliary/dos/http/hashcollision_dosHashtable Collisionsfunctional · metasploit

affected products (63)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apache tomcat= 5.5.35nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.0nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.1nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.10nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.11nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.12nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.13nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.14nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.15nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.16nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.17nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.18nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.19nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.2nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.20nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.21nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.22nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.23nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat= 6.0.24nvdUScpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

showing 20 of 63

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-wr3m-gw98-mc3jImproper Input Validation in Apache Tomcat2022-05-14ghsa · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2012-01-05modified 2026-06-16

related (3,726)

Related entries.

ID	severity	EPSS	exploitable	published
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CVE-2018-0179US	medium5.9OT critical	4.93% (92nd)	KEV	2018-03-28
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A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could allow an authenticated,…
CVE-2018-0156US	high7.5OT critical	9.36% (95th)	KEV	2018-03-28
A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected devi…
CVE-2018-0154US	high7.5OT critical	7.07% (94th)	KEV	2018-03-28
A vulnerability in the crypto engine of the Cisco Integrated Services Module for VPN (ISM-VPN) running Cisco IOS Software could allow an unauthenticated, remote attacker to cause a…

+3721 more

references (59)

External citations — patches, advisories, analysis.

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