UpHeron
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Servers and applications

CVE-2012-2733

java/org/apache/coyote/http11/InternalNioInputBuffer.java in the HTTP NIO connector in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.28 does not properly restrict the request-header size, which allows remote attackers to cause a denial of service (memory consumption) via a large amount of header data.

Severity
Medium 5.0
Published
16 Nov 2012
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
8.7% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • Version 7.0.25
  • Version 7.0.23
  • Version 7.0.22
  • Version 7.0.21
All 69 release lines
  • Version 6.0.0-alpha
  • Version 6.0
  • Version 6.0.1-alpha
  • Version 6.0.1
  • Version 6.0.2-alpha
  • Version 6.0.2-beta
  • Version 6.0.2
  • Version 6.0.3
  • Version 6.0.4-alpha
  • Version 6.0.4
  • Version 6.0.5
  • Version 6.0.6-alpha
  • Version 6.0.6
  • Version 6.0.7-alpha
  • Version 6.0.7-beta
  • Version 6.0.7
  • Version 6.0.8-alpha
  • Version 6.0.8
  • Version 6.0.9-beta
  • Version 6.0.9
  • Version 6.0.10
  • Version 6.0.11
  • Version 6.0.12
  • Version 6.0.13
  • Version 6.0.14
  • Version 6.0.15
  • Version 6.0.16
  • Version 6.0.17
  • Version 6.0.18
  • Version 6.0.19
  • Version 6.0.20
  • Version 6.0.24
  • Version 6.0.26
  • Version 6.0.27
  • Version 6.0.28
  • Version 6.0.29
  • Version 6.0.30
  • Version 6.0.31
  • Version 6.0.32
  • Version 6.0.33
  • Version 6.0.35
  • Version 7.0.0-beta
  • Version 7.0.0
  • Version 7.0.1
  • Version 7.0.2-beta
  • Version 7.0.2
  • Version 7.0.3
  • Version 7.0.4-beta
  • Version 7.0.4
  • Version 7.0.5
  • Version 7.0.6
  • Version 7.0.7
  • Version 7.0.8
  • Version 7.0.9
  • Version 7.0.10
  • Version 7.0.11
  • Version 7.0.12
  • Version 7.0.13
  • Version 7.0.14
  • Version 7.0.15
  • Version 7.0.16
  • Version 7.0.17
  • Version 7.0.18
  • Version 7.0.19
  • Version 7.0.20
  • Version 7.0.21
  • Version 7.0.22
  • Version 7.0.23
  • Version 7.0.25

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2012-2733
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2012-2733