CVE-2011-10020Public exploitNetwork attack vector

Unauthenticated service crash via malformed UDP packet

Published Aug 20, 2025 · Updated May 15, 2026

Improper input validation in Kaillera Server 0.86 allows remote attackers to crash the service with a malformed UDP packet after a handshake. The UDP packet handler accepts a malformed follow-up datagram after HELLO0.83 instead of rejecting it, causing the server to terminate and stop responding. Network access is sufficient and no authentication or user interaction is required; the documented consequence is a service crash with no reported data exposure or modification.

CVSS severity8.7
High
EPSS probability0.91%
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 Kaillera Server 0.86 allows remote attackers to crash the service with a malformed UDP packet after a handshake. The UDP packet handler accepts a malformed follow-up datagram after HELLO0.83 instead of rejecting it, causing the server to terminate and stop responding. Network access is sufficient and no authentication or user interaction is required; the documented consequence is a service crash with no reported data exposure or modification.

The record

CVE
CVE-2011-10020
Published
Aug 20, 2025
Updated
May 15, 2026
Vendor
Kaillera Project
Product
Kaillera Server
Classifications
CWE-20, CAPEC-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 15, 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 <=0.86

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kaillera Project · Kaillera Serverversion=0 <=0.86

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CAPEC-130Excessive Allocation
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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