CVE-2021-21729

Unauthorized operations via missing CSRF token validation

Published Apr 13, 2021 · Updated Aug 3, 2024

CSRF in ZTE ZXHN H168N 3.5.0_EG1T5_TE and H108N 2.5.5_BTMT1 allows attackers to perform unauthorized operations via crafted requests. Affected pages accept state-changing requests without verifying a per-request random CSRF value, so a forged message is treated as authorized. Exploitation depends on the request carrying an authenticated user's authority; ZTE does not identify the affected pages or bound the operations they expose.

CVSS severity6.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in ZTE ZXHN H168N 3.5.0_EG1T5_TE and H108N 2.5.5_BTMT1 allows attackers to perform unauthorized operations via crafted requests. Affected pages accept state-changing requests without verifying a per-request random CSRF value, so a forged message is treated as authorized. Exploitation depends on the request carrying an authenticated user's authority; ZTE does not identify the affected pages or bound the operations they expose.

The record

CVE
CVE-2021-21729
Published
Apr 13, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, CWE-330
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.5ZTECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CWE-330Use of Insufficiently Random Values

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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