CVE-2026-15316

Service interruption via oversized credential ciphertext

Published Aug 18, 2026 · Updated Aug 20, 2026

Improper input validation in TP-Link Tapo C200 before V5_1.4.6 Build 260709 Rel.27675n allows attackers to crash or restart it. The configuration service accepts oversized encrypted credential ciphertext and fails to reject it before exception-handling paths can terminate or restart the device process. Exposure is bounded to reachable management traffic, and the documented consequence is temporary loss of HTTPS management and monitoring until the service recovers.

CVSS severity7.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in TP-Link Tapo C200 before V5_1.4.6 Build 260709 Rel.27675n allows attackers to crash or restart it. The configuration service accepts oversized encrypted credential ciphertext and fails to reject it before exception-handling paths can terminate or restart the device process. Exposure is bounded to reachable management traffic, and the documented consequence is temporary loss of HTTPS management and monitoring until the service recovers.

The record

CVE
CVE-2026-15316
Published
Aug 18, 2026
Updated
Aug 20, 2026
Vendor
TP-Link Systems Inc.
Product
Tapo C200
Classifications
CWE-20, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V5_1.4.6 Build 260709 Rel.27675n

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TP-Link Systems Inc. · Tapo C200version=0 <V5_1.4.6 Build 260709 Rel.27675n

Published CVSS scores

7.1TPLinkCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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