NVD / CVE Program· CNA twcert

CVE-2021-28194: ASUS BMC's firmware: buffer overflow - Remote image configuration setting

MediumCVSS 4.9 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 20/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 1.8% (FIRST EPSS); higher than 79.6% of all records.
Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The specific function in ASUS BMC’s firmware Web management page (Remote image configuration setting) does not verify the string length entered by users, resulting in a Buffer overflow vulnerability. As obtaining the privileged permission, remote attackers use the leakage to abnormally terminate the Web service.

Published: Apr 6, 2021
Updated: Jun 16, 2026
EPSS: 1.8% · 79th percentile
CWE: CWE-120

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 19 / 40 · 4.9 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 1.8%

CNA vs NVD score

NVD: 4.9
CNA · twcert: 4.9; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
asus	asmb9-ikvm firmware	cpe:2.3:o:asus:asmb9-ikvm_firmware
asus	asmb9-ikvm	cpe:2.3:h:asus:asmb9-ikvm
asus	rs720a-e9-rs24-e firmware	cpe:2.3:o:asus:rs720a-e9-rs24-e_firmware
asus	rs720a-e9-rs24-e	cpe:2.3:h:asus:rs720a-e9-rs24-e
asus	rs700a-e9-rs4 firmware	cpe:2.3:o:asus:rs700a-e9-rs4_firmware
asus	rs700a-e9-rs4	cpe:2.3:h:asus:rs700a-e9-rs4
asus	rs700-e9-rs4 firmware	cpe:2.3:o:asus:rs700-e9-rs4_firmware
asus	rs700-e9-rs4	cpe:2.3:h:asus:rs700-e9-rs4
asus	esc4000 g4x firmware	cpe:2.3:o:asus:esc4000_g4x_firmware
asus	esc4000 g4x	cpe:2.3:h:asus:esc4000_g4x
asus	rs700-e9-rs12 firmware	cpe:2.3:o:asus:rs700-e9-rs12_firmware
asus	rs700-e9-rs12	cpe:2.3:h:asus:rs700-e9-rs12

and 76 more

Versions reported by the vendor

Affected version ranges reported by the assigning authority (twcert). Independent of NVD's CPE analysis and usually ahead of it.

ASUS BMC firmware for ASMB9-iKVM
- 1.11.12affected
ASUS BMC firmware for E700 G4
- 1.14.1affected
ASUS BMC firmware for ESC4000 DHD G4
- 1.13.7affected
ASUS BMC firmware for ESC4000 G4
- 1.15.2affected
ASUS BMC firmware for ESC4000 G4X
- 1.11.6affected
ASUS BMC firmware for ESC8000 G4
- 1.15.4affected
ASUS BMC firmware for ESC8000 G4/10G
- 1.15.4affected
ASUS BMC firmware for KNPA-U16
- 1.13.4affected
ASUS BMC firmware for Pro E800 G4
- 1.14.2affected
ASUS BMC firmware for RS100-E10-PI2
- 1.13.6affected
ASUS BMC firmware for RS300-E10-PS4
- 1.13.6affected
ASUS BMC firmware for RS300-E10-RS4
- 1.13.6affected

Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

asus asmb9-ikvm firmware1.11.12
asus e700 g4 firmware1.14.1
asus esc4000 dhd g4 firmware1.13.7
asus esc4000 g4 firmware1.15.2
asus esc4000 g4x firmware1.11.6
asus esc8000 g4 firmware1.15.4
asus esc8000 g4/10g firmware1.15.4
asus knpa-u16 firmware1.13.4
asus pro e800 g4 firmware1.14.2
asus rs100-e10-pi2 firmware1.13.6
asus rs300-e10-ps4 firmware1.13.6
asus rs300-e10-rs4 firmware1.13.6
asus rs500-e9-ps4 firmware1.15.4
asus rs500-e9-rs4 firmware1.15.4
asus rs500-e9-rs4-u firmware1.15.4
asus rs500a-e10-ps4 firmware1.15.2
asus rs500a-e10-rs4 firmware1.15.2
asus rs500a-e9 rs4 u firmware1.14.1
asus rs500a-e9-ps4 firmware1.14.1
asus rs500a-e9-rs4 firmware1.14.1

Same product

asus: all records

Other highest-scoring records for the same primary product.

CVE-2021-28209ASUS BMC's firmware: path traversal - Delete video file function
20Monitor
CVE-2021-28208ASUS BMC's firmware: path traversal - Get video file function
20Monitor
CVE-2021-28207ASUS BMC's firmware: path traversal - Get Help file function
20Monitor

Published before and after this one in the same product

← EarlierCVE-2021-28192Apr 6, 2021 · ASUS BMC's firmware: buffer overflow - Remote video storage function
20Monitor
← EarlierCVE-2021-28193Apr 6, 2021 · ASUS BMC's firmware: buffer overflow - SMTP configuration function
20Monitor
Later →CVE-2021-28195Apr 6, 2021 · ASUS BMC's firmware: buffer overflow - Radius configuration function
20Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-21-0295 · Apr 7, 2021(ASUS Cihazlarda Güvenlik Zafiyeti)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
Administrator privileges are required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

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Change log (0)

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

www.asus.com/content/ASUS-Product-Security-Advisory/

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records