CVE-2012-3571

CVE-2012-3571 is a medium-severity vulnerability in Isc Dhcp with a CVSS 2.0 base score of 6.1. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.1)
• EPSS exploit prediction: 13% (96th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Isc Dhcp
• Published: 2012-07-25
• Last modified: 2026-06-16

Description

ISC DHCP 4.1.2 through 4.2.4 and 4.1-ESV before 4.1-ESV-R6 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a malformed client identifier.

Frequently asked questions

What is CVE-2012-3571?

ISC DHCP 4.1.2 through 4.2.4 and 4.1-ESV before 4.1-ESV-R6 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a malformed client identifier.

How severe is CVE-2012-3571?

CVE-2012-3571 has a CVSS 2.0 base score of 6.1, rated medium severity.

Is CVE-2012-3571 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-3571?

CVE-2012-3571 primarily affects Isc Dhcp. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-3571?

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

When was CVE-2012-3571 published?

CVE-2012-3571 was published on 2012-07-25 and last updated on 2026-06-16.

References

• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
• http://lists.opensuse.org/opensuse-updates/2012-08/msg00030.html
• http://rhn.redhat.com/errata/RHSA-2012-1140.html
• http://rhn.redhat.com/errata/RHSA-2012-1141.html
• http://security.gentoo.org/glsa/glsa-201301-06.xml
• http://www.debian.org/security/2012/dsa-2516
• http://www.debian.org/security/2012/dsa-2519
• http://www.mandriva.com/security/advisories?name=MDVSA-2012:115
• http://www.mandriva.com/security/advisories?name=MDVSA-2012:116
• http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
• http://www.securityfocus.com/bid/54665
• http://www.ubuntu.com/usn/USN-1519-1
• https://kb.isc.org/article/AA-00712

Affected products (33)

• cpe:2.3:a:isc:dhcp:4.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.0:-:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.0:a1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.0:a2:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.0:b1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.0:b2:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.0:p1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.1:-:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.1:b1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.1:rc1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.2:-:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.2:b1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.2:rc1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.3:-:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.3:p1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.3:p2:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.2.4:*:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r2:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r3:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r3_b1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r4:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r5:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r5_b1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc1:*:*:*:*:*:*
• cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc2:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:11.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
• cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

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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…
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