CRITICAL
CVE-2021-26797
CWE-521Published: April 26, 2021· Updated: Jun 17, 2026
9.8
CVSS v3.1
Official Description
An access control vulnerability in Hame SD1 Wi-Fi firmware <=V.20140224154640 allows an attacker to get system administrator through an open Telnet service.
Technical Analysis
CVE-2021-26797 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Vendors & Products
hametech2 product(s)
hame sd1 wi-fi firmwarehame sd1 wi-fi
Source: NVD CPE · 2 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (2)
→
https://le0nc.blogspot.com/2021/04/cve-2021-26797-access-control.htmlExploit · Third Party Advisory
→
https://le0nc.blogspot.com/2021/04/cve-2021-26797-access-control.htmlExploit · Third Party Advisory
Quick Facts
CVE IDCVE-2021-26797
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-521
CISA KEVNo
Affected1 vendor(s)
PublishedApr 26, 2021
Related CVEs (CWE-521)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-26797 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.