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Rv320 Firmware CVE-2024-20518

CRITICAL
Stack-based Buffer Overflow (CWE-121)
2024-10-02 psirt@cisco.com
9.1
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Stack buffer bounds checking
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 9.1 (CRITICAL). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 0.6% exploitation probability (EPSS)

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AnalysisAI

A vulnerability in the web-based management interface of Cisco Small Business RV042, RV042G, RV320, and RV325 Routers could allow an authenticated, Administrator-level, remote attacker to execute. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, 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

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-121. A vulnerability in the web-based management interface of Cisco Small Business RV042, RV042G, RV320, and RV325 Routers could allow an authenticated, Administrator-level, remote attacker to execute arbitrary code as the root user. To exploit this vulnerability, an attacker would need to have valid Administrator credentials on the affected device.   This vulnerability is due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code on the underlying operating system as the root user. Affected products include: Cisco Rv042 Firmware, Cisco Rv042G Firmware, Cisco Rv320 Firmware, Cisco Rv325 Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.1 CRITICAL
AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

A vulnerability in the web-based management interface of Cisco Small Business RV042, RV042G, RV320, and RV325 Routers could allow an authenticated, Administrator-level, remote attacker to execute arbitrary code as the root user. To exploit this vulnerability, an attacker would need to have valid Administrator credentials on the affected device.   This vulnerability is due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code on the underlying operating system as the root user.

Threat Intelligence Overview

EPSS Score
0.6%
Top 55% exploitable
Data Quality
2 sources
Confidence: Low

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 CRITICAL
CISA KEV No
Public POC No
EPSS 0.6%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
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
No
Human Impact· derived
Medium

Priority Score

47
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +46
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:o:cisco:rv042_firmware:1.0.1.17:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.0.2.03:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.1.0.09:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.1.1.06:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.1.1.19:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.2.1.13:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.2.1.14:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.3.1.10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.3.1.12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.3.2.02:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.3.12.6-tm:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.3.12.19-tm:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.3.13.02-tm:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.4.2.15:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.4.2.17:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.4.2.19:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.4.2.20:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.4.2.22:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.5.1.05:*:*:*:*:*:*:*
cpe:2.3:o:cisco:rv042_firmware:1.5.1.11:*:*:*:*:*:*:*
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