CVE-2021-21727
HIGH
7.5
CVSS Score
Published: March 29, 2021 at 03:41 PM UTC
Updated: June 17, 2026 at 03:36 AM UTC
2 products affected across 1 vendorZxhn F623 FirmwareZxhn F623
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Severity
HIGH7.5
Exploit prediction
EPSS 1%
Description
A ZTE product has a DoS vulnerability. A remote attacker can amplify traffic by sending carefully constructed IPv6 packets to the affected devices, which eventually leads to device denial of service. This affects:<ZXHN F623><All versions up to V6.0.0P3T33>
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 6.0.0p3t34<ZXHN Z500 V1.0.0.2B1.1000 & ZXHN F670L V1.1.10P1N2E>
Affected range stops below 6.0.0p3t34, so it looks safe — our inference, not a vendor statement
zte-zxhn-f623 (same device)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
x_refsource_MISCVendor Advisory
Source: [email protected]
https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1014744CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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