CVE-2024-41335Network attack vector

Credential disclosure via non-constant-time password comparison

Published Feb 27, 2025 · Updated Jul 5, 2026

Timing side channel in DrayTek Vigor router firmware allows remote attackers to recover password information through network requests. Credential comparison paths call strcmp and memcmp, whose data-dependent early exits make response timing vary with the number of matching input bytes. Repeated unauthenticated requests to a reachable credential-checking interface can disclose credential information without changing router data or availability.

CVSS severity7.5
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timing side channel in DrayTek Vigor router firmware allows remote attackers to recover password information through network requests. Credential comparison paths call strcmp and memcmp, whose data-dependent early exits make response timing vary with the number of matching input bytes. Repeated unauthenticated requests to a reachable credential-checking interface can disclose credential information without changing router data or availability.

The record

CVE
CVE-2024-41335
Published
Feb 27, 2025
Updated
Jul 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-203, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 5, 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?

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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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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-203Observable Discrepancy
T1110Brute Force

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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