CVE-2011-4869

validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.

Published: 2011-12-20 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4869 is rated Moderate Risk (60.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.08%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-4869

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-18 1.35% 2.08% +0.73%
2 2025-03-30 2.11% 1.35% -0.75%
3 2025-03-29 — 2.11% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4869

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2011-4869

OS Trackers for CVE-2011-4869

vendor priority summary link
debian medium CVE-2011-4869 medium priority: Debian including 1 source packages (unbound), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-4869
gentoo normal CVE-2011-4869: 1 GLSA(s) (201311-18), 1 atom(s) (net-dns/unbound); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-4869
ubuntu medium CVE-2011-4869 medium priority: Ubuntu including 1 source packages (unbound), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): released 4, DNE 1, not-affected 1. https://ubuntu.com/security/CVE-2011-4869

Affected software / configurations for CVE-2011-4869

Vendor Product Version Raw CPE
unbound unbound <= 1.4.12 cpe:2.3:a:unbound:unbound:*:*:*:*:*:*:*:*
unbound unbound 0.0 cpe:2.3:a:unbound:unbound:0.0:*:*:*:*:*:*:*
unbound unbound 0.1 cpe:2.3:a:unbound:unbound:0.1:*:*:*:*:*:*:*
unbound unbound 0.2 cpe:2.3:a:unbound:unbound:0.2:*:*:*:*:*:*:*
unbound unbound 0.3 cpe:2.3:a:unbound:unbound:0.3:*:*:*:*:*:*:*
unbound unbound 0.4 cpe:2.3:a:unbound:unbound:0.4:*:*:*:*:*:*:*
unbound unbound 0.5 cpe:2.3:a:unbound:unbound:0.5:*:*:*:*:*:*:*
unbound unbound 0.6 cpe:2.3:a:unbound:unbound:0.6:*:*:*:*:*:*:*
unbound unbound 0.7 cpe:2.3:a:unbound:unbound:0.7:*:*:*:*:*:*:*
unbound unbound 0.7.1 cpe:2.3:a:unbound:unbound:0.7.1:*:*:*:*:*:*:*
unbound unbound 0.7.2 cpe:2.3:a:unbound:unbound:0.7.2:*:*:*:*:*:*:*
unbound unbound 0.8 cpe:2.3:a:unbound:unbound:0.8:*:*:*:*:*:*:*
unbound unbound 0.09 cpe:2.3:a:unbound:unbound:0.09:*:*:*:*:*:*:*
unbound unbound 0.10 cpe:2.3:a:unbound:unbound:0.10:*:*:*:*:*:*:*
unbound unbound 0.11 cpe:2.3:a:unbound:unbound:0.11:*:*:*:*:*:*:*
unbound unbound 1.0.0 cpe:2.3:a:unbound:unbound:1.0.0:*:*:*:*:*:*:*
unbound unbound 1.0.1 cpe:2.3:a:unbound:unbound:1.0.1:*:*:*:*:*:*:*
unbound unbound 1.0.2 cpe:2.3:a:unbound:unbound:1.0.2:*:*:*:*:*:*:*
unbound unbound 1.1.0 cpe:2.3:a:unbound:unbound:1.1.0:*:*:*:*:*:*:*
unbound unbound 1.1.1 cpe:2.3:a:unbound:unbound:1.1.1:*:*:*:*:*:*:*
unbound unbound 1.2.0 cpe:2.3:a:unbound:unbound:1.2.0:*:*:*:*:*:*:*
unbound unbound 1.2.1 cpe:2.3:a:unbound:unbound:1.2.1:*:*:*:*:*:*:*
unbound unbound 1.3.0 cpe:2.3:a:unbound:unbound:1.3.0:*:*:*:*:*:*:*
unbound unbound 1.3.1 cpe:2.3:a:unbound:unbound:1.3.1:*:*:*:*:*:*:*
unbound unbound 1.3.2 cpe:2.3:a:unbound:unbound:1.3.2:*:*:*:*:*:*:*
unbound unbound 1.3.3 cpe:2.3:a:unbound:unbound:1.3.3:*:*:*:*:*:*:*
unbound unbound 1.3.4 cpe:2.3:a:unbound:unbound:1.3.4:*:*:*:*:*:*:*
unbound unbound 1.4.0 cpe:2.3:a:unbound:unbound:1.4.0:*:*:*:*:*:*:*
unbound unbound 1.4.1 cpe:2.3:a:unbound:unbound:1.4.1:*:*:*:*:*:*:*
unbound unbound 1.4.2 cpe:2.3:a:unbound:unbound:1.4.2:*:*:*:*:*:*:*
unbound unbound 1.4.3 cpe:2.3:a:unbound:unbound:1.4.3:*:*:*:*:*:*:*
unbound unbound 1.4.4 cpe:2.3:a:unbound:unbound:1.4.4:*:*:*:*:*:*:*
unbound unbound 1.4.5 cpe:2.3:a:unbound:unbound:1.4.5:*:*:*:*:*:*:*
unbound unbound 1.4.6 cpe:2.3:a:unbound:unbound:1.4.6:*:*:*:*:*:*:*
unbound unbound 1.4.7 cpe:2.3:a:unbound:unbound:1.4.7:*:*:*:*:*:*:*
unbound unbound 1.4.8 cpe:2.3:a:unbound:unbound:1.4.8:*:*:*:*:*:*:*
unbound unbound 1.4.9 cpe:2.3:a:unbound:unbound:1.4.9:*:*:*:*:*:*:*
unbound unbound 1.4.10 cpe:2.3:a:unbound:unbound:1.4.10:*:*:*:*:*:*:*
unbound unbound 1.4.11 cpe:2.3:a:unbound:unbound:1.4.11:*:*:*:*:*:*:*

References for CVE-2011-4869

cvelogic Threat Intelligence