CVE-2025-27918Public exploitNetwork attack vector

Remote client crash via PNG size overflow

Published Nov 6, 2025 · Updated Nov 6, 2025

Heap-based buffer overflow in AnyDesk allows remote attackers to crash affected clients via a crafted UDP image-size field. The PNG parser performs an overflow-prone size-plus-offset check, allocates PNG size plus 0xC, and copies image data after 0xFFFFFFFF wraps the allocation to 11 bytes. Affected releases are Windows before 9.0.5, macOS before 9.0.1, Linux before 7.0.0, iOS before 7.1.2, and Android before 8.0.0; connection requests require no privileges or user interaction and remain reachable despite an access-control list.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in AnyDesk allows remote attackers to crash affected clients via a crafted UDP image-size field. The PNG parser performs an overflow-prone size-plus-offset check, allocates PNG size plus 0xC, and copies image data after 0xFFFFFFFF wraps the allocation to 11 bytes. Affected releases are Windows before 9.0.5, macOS before 9.0.1, Linux before 7.0.0, iOS before 7.1.2, and Android before 8.0.0; connection requests require no privileges or user interaction and remain reachable despite an access-control list.

The record

CVE
CVE-2025-27918
Published
Nov 6, 2025
Updated
Nov 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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?

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

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7Czech Technical University in Prague thesisCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

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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