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CVE-2021-21728

MEDIUM
5.3
CVSS Score
Published: April 9, 2021 at 05:23 PM UTC
Updated: June 17, 2026 at 03:36 AM UTC
2 products affected across 1 vendorZXA10 C300M FirmwareZXA10 C300M

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1.0%

Description

A ZTE product has a configuration error vulnerability. Because a certain port is open by default, an attacker can consume system processing resources by flushing a large number of packets to the port, and successfully exploiting this vulnerability could reduce system processing capabilities. This affects: ZXA10 C300M all versions up to V4.3P8.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

ZXA10 C300M Firmware· ZTE
95%
v < 4.5
Affected range stops below 4.5, so it looks safe — our inference, not a vendor statement
zte-zxa10-c300m (same device)
ZXA10 C300M· ZTE
60%
v ≤ 4.3P8

Remediation

No guide yet

No 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=1014784

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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