UpHeron
All vulnerabilities

Servers and applications

CVE-2009-3602

Unbound before 1.3.4 does not properly verify signatures for NSEC3 records, which allows remote attackers to cause secure delegations to be downgraded via DNS spoofing or other DNS-related attacks in conjunction with crafted delegation responses.

Severity
High 7.5
Published
13 Oct 2009
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
3% in the next 30 daysHigher than 87% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-310
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
UnboundServers and applications · cpe:a:nlnetlabs:unbound
  • Version 1.3.2
  • Version 1.3.1
  • Version 1.3.0
  • Version 1.2.1
All 25 release lines
  • Every version up to 1.3.3
  • Version 0.0
  • Version 0.1
  • Version 0.2
  • Version 0.3
  • Version 0.4
  • Version 0.5
  • Version 0.6
  • Version 0.7
  • Version 0.7.1
  • Version 0.7.2
  • Version 0.8
  • Version 0.09
  • Version 0.10
  • Version 0.11
  • Version 1.0.0
  • Version 1.0.1
  • Version 1.0.2
  • Version 1.1.0
  • Version 1.1.1
  • Version 1.2.0
  • Version 1.2.1
  • Version 1.3.0
  • Version 1.3.1
  • Version 1.3.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2009-3602
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2009-3602