CVE-2025-5863Public exploitNetwork attack vector

Memory corruption via rebootTime stack overflow

Published Jun 9, 2025 · Updated Jun 10, 2025

Stack-based buffer overflow in Tenda AC5 15.03.06.47 allows remote authenticated users to corrupt memory via a crafted rebootTime value. The formSetRebootTimer handler passes the POST-supplied rebootTime string to sscanf with %d:%d destinations whose stack storage can be overrun. Access to the router management endpoint is required; the record establishes stack corruption but does not demonstrate whether it causes a crash or code execution.

CVSS severity9.8
Critical
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda AC5 15.03.06.47 allows remote authenticated users to corrupt memory via a crafted rebootTime value. The formSetRebootTimer handler passes the POST-supplied rebootTime string to sscanf with %d:%d destinations whose stack storage can be overrun. Access to the router management endpoint is required; the record establishes stack corruption but does not demonstrate whether it causes a crash or code execution.

The record

CVE
CVE-2025-5863
Published
Jun 9, 2025
Updated
Jun 10, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC5
Classifications
CWE-787, CWE-121, CWE-119
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2025Record 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=15.03.06.47

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC5version=15.03.06.47

Published CVSS scores

7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

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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