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iOS CVE-2023-20080

HIGH
Improper Validation of Array Index (CWE-129)
2023-03-23 psirt@cisco.com
Denial Of Service Apple iOS Cisco Ios Xe
7.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-129
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Array index validation
Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 1.0% exploitation probability (EPSS)

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AnalysisAI

A vulnerability in the IPv6 DHCP version 6 (DHCPv6) relay and server features of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS). Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. 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.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified under CWE-129. A vulnerability in the IPv6 DHCP version 6 (DHCPv6) relay and server features of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to insufficient validation of data boundaries. An attacker could exploit this vulnerability by sending crafted DHCPv6 messages to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. Affected products include: Cisco Ios, Cisco Ios Xe. Version information: version 6.

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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/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
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionNVD

A vulnerability in the IPv6 DHCP version 6 (DHCPv6) relay and server features of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to insufficient validation of data boundaries. An attacker could exploit this vulnerability by sending crafted DHCPv6 messages to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly.

Threat Intelligence Overview

EPSS Score
1.0%
Top 43% exploitable
Data Quality
2 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 HIGH
CISA KEV No
Public POC No
EPSS 1.0%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +38
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)NVD

cpe:2.3:o:cisco:ios:12.2\(6\)i1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy4a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy9:*:*:*:*:*:*:*
+ 832 more

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Same weakness CWE-129 – Improper Validation of Array Index

View all
CVE-2022-35737 HIGH POC
7.5
CVE-2016-9053 CRITICAL POC
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CVE-2020-27485 CRITICAL POC
9.9
CVE-2020-27483 CRITICAL POC
9.9
CVE-2024-24563 CRITICAL POC
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CVE-2017-8797 HIGH
7.5
CVE-2018-11489 HIGH POC
8.8
CVE-2026-16651 HIGH POC
8.7

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
7.8

References

Advisories & patches
ADVISORY https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-dhcpv6-dos-44cMvdDK

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