CVE-2022-25440Network attack vector

Service interruption via unbounded NTP server input

Published Mar 18, 2022 · Updated Aug 3, 2024

Stack overflow in Tenda AC9 firmware 15.03.2.21 allows remote attackers to interrupt router service via a crafted ntpserver value. SetSysTimeCfg accepts an oversized ntpserver value without enforcing the capacity of its stack storage, corrupting adjacent stack data. The management interface must be network reachable; no authentication or user interaction is required, and no code-execution effect is established.

CVSS severity9.8
Critical
EPSS probability1.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Tenda AC9 firmware 15.03.2.21 allows remote attackers to interrupt router service via a crafted ntpserver value. SetSysTimeCfg accepts an oversized ntpserver value without enforcing the capacity of its stack storage, corrupting adjacent stack data. The management interface must be network reachable; no authentication or user interaction is required, and no code-execution effect is established.

The record

CVE
CVE-2022-25440
Published
Mar 18, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2022CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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.

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No observations available

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

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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