How severe is CVE-2011-4868?

CVE-2011-4868 has a CVSS 2.0 base score of 6.1, rated medium severity.

Is CVE-2011-4868 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4868?

CVE-2011-4868 primarily affects Isc Dhcp. In total, 102 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4868?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-4868 published?

CVE-2011-4868 was published on 2012-01-15 and last updated on 2026-06-16.

CVE-2011-4868

CVE-2011-4868 is a medium-severity vulnerability in Isc Dhcp with a CVSS 2.0 base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Medium (CVSS 2.0 base score 6.1)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Isc Dhcp
Published: 2012-01-15
Last modified: 2026-06-16

Description

The logging functionality in dhcpd in ISC DHCP before 4.2.3-P2, when using Dynamic DNS (DDNS) and issuing IPv6 addresses, does not properly handle the DHCPv6 lease structure, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via crafted packets related to a lease-status update.

Frequently asked questions

What is CVE-2011-4868?: The logging functionality in dhcpd in ISC DHCP before 4.2.3-P2, when using Dynamic DNS (DDNS) and issuing IPv6 addresses, does not properly handle the DHCPv6 lease structure, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via crafted packets related to a lease-status update.
How severe is CVE-2011-4868?: CVE-2011-4868 has a CVSS 2.0 base score of 6.1, rated medium severity.
Is CVE-2011-4868 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4868?: CVE-2011-4868 primarily affects Isc Dhcp. In total, 102 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4868?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4868 published?: CVE-2011-4868 was published on 2012-01-15 and last updated on 2026-06-16.

References

Affected products (102)

cpe:2.3:a:isc:dhcp:*:p1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:*:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel1:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel10:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel11:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel12:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel13:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel14:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel15:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel16:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel18:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel19:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel2:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel20:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel21:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel22:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel23:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel24:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel3:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel4:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel5:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel6:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel7:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel8:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:beta2:patchlevel9:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc1:patchlevel1:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc10:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc11:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc12:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc2:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc2:patchlevel1:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc3:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc4:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc5:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc6:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc7:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc8:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc8:patchlevel1:*:*:*:*:*
cpe:2.3:a:isc:dhcp:3.0:rc9:*:*:*:*:*:*

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CVE-2011-2749 — High (CVSS 7.8): The server in ISC DHCP 3.x and 4.x before 4.2.2, 3.1-ESV before 3.1-ESV-R3, and 4.1-ESV before 4.1-ESV-R3 allows remote…
CVE-2011-2748 — High (CVSS 7.8): The server in ISC DHCP 3.x and 4.x before 4.2.2, 3.1-ESV before 3.1-ESV-R3, and 4.1-ESV before 4.1-ESV-R3 allows remote…
CVE-2011-0413 — High (CVSS 7.8): The DHCPv6 server in ISC DHCP 4.0.x and 4.1.x before 4.1.2-P1, 4.0-ESV and 4.1-ESV before 4.1-ESV-R1, and 4.2.x before…
CVE-2018-5732 — High (CVSS 7.5): Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity…
CVE-2018-5733 — High (CVSS 7.5): A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can…

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CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
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