What is the CVSS score of CVE-2021-28209?

CVE-2021-28209 has a CVSS 3.1 base score of 4.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 1.9%.

Asmb9 Ikvm Firmware CVE-2021-28209

MEDIUM

Path Traversal (CWE-22)

2021-04-06 twcert@cert.org.tw

Path Traversal Asmb9 Ikvm Firmware Rs720A E9 Rs24 E Firmware Rs700A E9 Rs4 Firmware Rs700 E9 Rs4 Firmware Esc4000 G4X Firmware Rs700 E9 Rs12 Firmware Rs100 E10 Pi2 Firmware Rs300 E10 Ps4 Firmware Rs300 E10 Rs4 Firmware Rs500A E9 Ps4 Firmware Rs500A E9 Rs4 Firmware Rs500A E9 Rs4 U Firmware E700 G4 Firmware Ws C422 Pro Se Firmware Ws X299 Pro Se Firmware Z11Pa U12 Firmware Z11Pa U12 10G 2S Firmware Knpa U16 Firmware Esc4000 Dhd G4 Firmware Esc4000 G4 Firmware Rs720Q E9 Rs24 S Firmware Rs720Q E9 Rs8 Firmware Rs720Q E9 Rs8 S Firmware Z11Pa D8 Firmware Z11Pa D8C Firmware Rs720 E9 Rs24 U Firmware Rs720 E9 Rs8 G Firmware Rs500 E9 Ps4 Firmware Pro E800 G4 Firmware Rs500 E9 Rs4 Firmware Rs500 E9 Rs4 U Firmware Rs520 E9 Rs12 E Firmware Rs520 E9 Rs8 Firmware Esc8000 G4 Firmware Esc8000 G4 10G Firmware Rs720 E9 Rs12 E Firmware Ws C621E Sage Firmware Rs500A E10 Ps4 Firmware Rs500A E10 Rs4 Firmware Rs700A E9 Rs12V2 Firmware Rs700A E9 Rs4V2 Firmware Rs720A E9 Rs12V2 Firmware Rs720A E9 Rs24V2 Firmware Z11Pr D16 Firmware Asus

4.9

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-22 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V5 - File Handling Path canonicalization, traversal prevention MITRE ATT&CK 2 techniques across 2 tactics: Discovery, Collection 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 4.9 (MEDIUM). Attack characteristics: network attack vector, low complexity, high privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could access files and directories outside the intended path by sending crafted requests to the affected application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 1.9% exploitation probability (EPSS)

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AnalysisAI

The specific function in ASUS BMC’s firmware Web management page (Delete video file function) does not filter the specific parameter. Rated medium severity (CVSS 4.9), 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. Validate and canonicalize file paths. Use chroot or sandboxing. Reject input containing path separators or '../' sequences.

Affects your stack

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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 Path Traversal (CWE-22), which allows attackers to access files and directories outside the intended path. The specific function in ASUS BMC’s firmware Web management page (Delete video file function) does not filter the specific parameter. As obtaining the administrator permission, remote attackers can use the means of path traversal to access system files. Affected products include: Asus Asmb9-Ikvm Firmware, Asus Rs720A-E9-Rs24-E Firmware, Asus Rs700A-E9-Rs4 Firmware, Asus Rs700-E9-Rs4 Firmware, Asus Esc4000 G4X Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 4.9 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionNVD

The specific function in ASUS BMC’s firmware Web management page (Delete video file function) does not filter the specific parameter. As obtaining the administrator permission, remote attackers can use the means of path traversal to access system files.

Threat Intelligence Overview

EPSS Score

1.9%

Top 23% 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 MEDIUM

CISA KEV No

Public POC No

EPSS 1.9%

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

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +2

CVSS: +24

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

Affected Products (CPE)NVD

cpe:2.3:o:asus:asmb9-ikvm_firmware:1.11.12:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs720a-e9-rs24-e_firmware:1.10.3:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs700a-e9-rs4_firmware:1.10.0:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs700-e9-rs4_firmware:1.09:*:*:*:*:*:*:*

cpe:2.3:o:asus:esc4000_g4x_firmware:1.11.6:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs700-e9-rs12_firmware:1.11.5:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs100-e10-pi2_firmware:1.13.6:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs300-e10-ps4_firmware:1.13.6:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs300-e10-rs4_firmware:1.13.6:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs500a-e9-ps4_firmware:1.14.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs500a-e9-rs4_firmware:1.14.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:rs500a-e9_rs4_u_firmware:1.14.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:e700_g4_firmware:1.14.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:ws_c422_pro\/se_firmware:1.14.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:ws_x299_pro\/se_firmware:1.14.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:z11pa-u12_firmware:1.15.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:z11pa-u12\/10g-2s_firmware:1.15.1:*:*:*:*:*:*:*

cpe:2.3:o:asus:knpa-u16_firmware:1.13.4:*:*:*:*:*:*:*

cpe:2.3:o:asus:esc4000_dhd_g4_firmware:1.13.7:*:*:*:*:*:*:*

cpe:2.3:o:asus:esc4000_g4_firmware:1.15.2:*:*:*:*:*:*:*

+ 24 more

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References

Advisories & patches

ADVISORY https://www.asus.com/content/ASUS-Product-Security-Advisory/ ADVISORY https://www.asus.com/tw/support/callus/ REF https://www.twcert.org.tw/tw/cp-132-4579-c8827-1.html

Search Externally

GitHub PoC

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