Username Enumeration
Observable discrepancies in the login process allow an attacker to guess legitimate user names registered in the BMC. This issue affects: Lanner Inc IAC-AST2500A standard firmware version 1.10.0.
- Published
- Oct 24, 2022
- Updated
- Jun 17, 2026
- EPSS
- 0.6% · 44th percentile
- CWE
- CWE-203
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.3
- CNA · Nozomi
- 5.3
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| lannerinc | iac-ast2500a firmware | cpe:2.3:o:lannerinc:iac-ast2500a_firmware |
| lannerinc | iac-ast2500a | cpe:2.3:h:lannerinc:iac-ast2500a |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- lannerinc iac-ast2500a firmware1.10.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Nozomi). Independent of NVD's CPE analysis and usually ahead of it.
Lanner Inc IAC-AST2500A
- 1.10.0affected
Same product
lannerinc: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-26731spx_restservice modifyUserb_func Command Injection and Multiple Stack-Based Buffer Overflows40Plan
- CVE-2021-26729spx_restservice Login_handler_func Command Injection and Multiple Stack-Based Buffer Overflows40Plan
- CVE-2021-26728spx_restservice KillDupUsr_func Command Injection and Stack-Based Buffer Overflow40Plan
- CVE-2021-26727spx_restservice SubNet_handler_func Multiple Command Injections and Stack-Based Buffer Overflows40Plan
- CVE-2021-26730spx_restservice Login_handler_func Subfunction Stack-Based Buffer Overflow39Monitor
- CVE-2021-46279Session Fixation and Insufficient Session Expiration35Monitor
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.
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 researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Andrea PalancaNozomi Networks
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).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-203 · Observable DiscrepancyCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
nvd-primary
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
—
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- www.nozominetworks.com/blog/vulnerabilities-in-bmc-firmware-affect-ot-iot-device-security-part-1/
- www.nozominetworks.com/labs/vulnerability-advisories/cve-2021-45925/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.