What is the CVSS score of CVE-2021-1509?

CVE-2021-1509 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.2%.

Vedge 100 Firmware CVE-2021-1509

HIGH

Buffer Overflow (CWE-119)

2021-05-06 psirt@cisco.com

RCE Buffer Overflow Denial Of Service Cisco Vedge 100 Firmware Vedge 100B Firmware Vedge 100M Firmware Vedge 100Wm Firmware Vedge 1000 Firmware Vedge 2000 Firmware Vedge 5000 Firmware Vedge Cloud Firmware

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-119 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, high complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could corrupt memory to execute arbitrary code or crash the application by sending crafted requests to the affected application.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 1.2% exploitation probability (EPSS)

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AnalysisAI

Multiple vulnerabilities in Cisco SD-WAN vEdge Software could allow an attacker to execute arbitrary code as the root user or cause a denial of service (DoS) condition on an affected device. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use memory-safe languages or bounds-checking. Enable ASLR, DEP/NX, stack canaries. Use safe string functions.

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 as Buffer Overflow (CWE-119), which allows attackers to corrupt memory to execute arbitrary code or crash the application. Multiple vulnerabilities in Cisco SD-WAN vEdge Software could allow an attacker to execute arbitrary code as the root user or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory. Affected products include: Cisco Vedge 100 Firmware, Cisco Vedge 1000 Firmware, Cisco Vedge 100B Firmware, Cisco Vedge 100M Firmware, Cisco Vedge 100Wm Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

Multiple vulnerabilities in Cisco SD-WAN vEdge Software could allow an attacker to execute arbitrary code as the root user or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Threat Intelligence Overview

EPSS Score

1.2%

Top 35% 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 1.2%

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

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.

Remote Code Execution CRITICAL

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

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:vedge_100_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_100_firmware:19.2.99:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_1000_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_1000_firmware:19.2.99:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_100b_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_100b_firmware:19.2.99:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_100m_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_100m_firmware:19.2.99:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_100wm_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_100wm_firmware:19.2.99:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_2000_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_2000_firmware:19.2.99:*:*:*:*:*:*:*

cpe:2.3:o:cisco:vedge_5000_firmware:*:*:*:*:*:*:*:*

+ 7 more

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References

Advisories & patches

ADVISORY https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-buffover-MWGucjtO

Search Externally

GitHub PoC

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