UpHeron
All vulnerabilities

Servers and applications

CVE-2011-4096

The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.

Severity
Medium 5.0
Published
17 Nov 2011
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
37% in the next 30 daysHigher than 98% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-399
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
SquidServers and applications · cpe:a:squid-cache:squid
  • Version 3.1.14
  • Version 3.1.13
  • Version 3.1.12
  • Version 3.1.11
All 65 release lines
  • Every version up to 3.1.15
  • Version 3.0-rc1
  • Version 3.0-rc4
  • Version 3.0.stable11-rc1
  • Version 3.0.stable16-rc1
  • Version 3.0
  • Version 3.0.stable1
  • Version 3.0.stable2
  • Version 3.0.stable3
  • Version 3.0.stable4
  • Version 3.0.stable5
  • Version 3.0.stable6
  • Version 3.0.stable7
  • Version 3.0.stable8
  • Version 3.0.stable9
  • Version 3.0.stable10
  • Version 3.0.stable11
  • Version 3.0.stable12
  • Version 3.0.stable13
  • Version 3.0.stable14
  • Version 3.0.stable15
  • Version 3.0.stable16
  • Version 3.0.stable17
  • Version 3.0.stable18
  • Version 3.0.stable19
  • Version 3.0.stable20
  • Version 3.0.stable21
  • Version 3.0.stable22
  • Version 3.0.stable23
  • Version 3.0.stable24
  • Version 3.0.stable25
  • Version 3.1
  • Version 3.1.0.1
  • Version 3.1.0.2
  • Version 3.1.0.3
  • Version 3.1.0.4
  • Version 3.1.0.5
  • Version 3.1.0.6
  • Version 3.1.0.7
  • Version 3.1.0.8
  • Version 3.1.0.9
  • Version 3.1.0.10
  • Version 3.1.0.11
  • Version 3.1.0.12
  • Version 3.1.0.13
  • Version 3.1.0.14
  • Version 3.1.0.15
  • Version 3.1.0.16
  • Version 3.1.0.17
  • Version 3.1.0.18
  • Version 3.1.1
  • Version 3.1.2
  • Version 3.1.3
  • Version 3.1.4
  • Version 3.1.5
  • Version 3.1.5.1
  • Version 3.1.6
  • Version 3.1.7
  • Version 3.1.8
  • Version 3.1.9
  • Version 3.1.10
  • Version 3.1.11
  • Version 3.1.12
  • Version 3.1.13
  • Version 3.1.14

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-4096
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-4096