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CVE-2021-28201· NVD / CVE Program· CNA twcert

ASUS BMC's firmware: buffer overflow - Service configuration-1 function

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 78.3% 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 Service configuration-1 function in ASUS BMC’s firmware Web management page 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.

MediumCVSS 4.9 · v3.1—No exploit No fix recorded
Published
Apr 6, 2021
Updated
Jun 16, 2026
EPSS
1.8% · 78th percentile

Report tools

JSON

Action score

20

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.

Follow CVE-2021-28201

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
asusasmb9-ikvm firmware
asusasmb9-ikvm
asusrs720a-e9-rs24-e firmware
asusrs720a-e9-rs24-e
asusrs700a-e9-rs4 firmware
asusrs700a-e9-rs4
asusrs700-e9-rs4 firmware
asusrs700-e9-rs4
asusesc4000 g4x firmware
asusesc4000 g4x
asusrs700-e9-rs12 firmware
asusrs700-e9-rs12

and 76 more

Affected versions

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

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

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-2021-28199Apr 6, 2021 · ASUS BMC's firmware: buffer overflow - Modify user’s information function
    20Monitor
  • ← EarlierCVE-2021-28200Apr 6, 2021 · ASUS BMC's firmware: buffer overflow - CD media configuration function
    20Monitor
  • Later →CVE-2021-28202Apr 6, 2021 · ASUS BMC's firmware: buffer overflow - Service configuration-2 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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

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

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(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.

ATT&CK techniques

—

Change log

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

References

Show all references (2 more)

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

All records