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Dhcp CVE-2015-8605

MEDIUM
Improper Input Validation (CWE-20)
2016-01-14 cve@mitre.org
Denial Of Service Debian Dhcp Canonical Debian Linux Ubuntu Linux Sophos Unified Threat Management Up2Date Isc
6.5
CVSS 3.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 6.5 (MEDIUM). Attack characteristics: adjacent network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 43.44%.
Exploit ScenarioDerived

Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 43.4% exploitation probability (EPSS)

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AnalysisAI

ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service (application crash) via an invalid length field in a UDP IPv4 packet. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. Epss exploitation probability 43.4% and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service (application crash) via an invalid length field in a UDP IPv4 packet. Affected products include: Sophos Unified Threat Management Up2Date, Isc Dhcp, Debian Debian Linux, Canonical Ubuntu Linux. Version information: before 4.1.

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Severity by source

NVD PRIMARY 6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionCVE.org

ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service (application crash) via an invalid length field in a UDP IPv4 packet.

Threat Intelligence Overview

EPSS Score
43.4%
Top 2% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 43.4%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Controlled
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

75
Low Medium High Critical
KEV: 0
EPSS: +43
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:sophos:unified_threat_management_up2date:*:*:*:*:*:*:*:*
cpe:2.3:a:sophos:unified_threat_management_up2date:*:*:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.2:-:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.2:p1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.3:-:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.3:rc1:*:*:*:*:*:*
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:r10:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r10_b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r11_b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc2:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r12:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r12_b1:*:*:*:*:*:*
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:*:*:*:*:*:*
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References

Advisories & patches
ADVISORY https://kb.isc.org/article/AA-01334 REF http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175594.html REF http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176031.html REF http://lists.opensuse.org/opensuse-updates/2016-02/msg00162.html REF http://lists.opensuse.org/opensuse-updates/2016-02/msg00168.html REF http://www.debian.org/security/2016/dsa-3442 REF http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html REF http://www.securityfocus.com/bid/80703 REF http://www.securitytracker.com/id/1034657 REF http://www.ubuntu.com/usn/USN-2868-1 REF https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/ REF https://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/

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