Kaillera 0.86 Server DoS via Malformed UDP Packet
Published Aug 20, 2025
8.7
HIGHCVSS 4.0
EPSS 0.91%
Description
Kaillera Server version 0.86 is vulnerable to a denial-of-service condition triggered by sending a malformed UDP packet after the initial handshake. Once a client sends a valid HELLO0.83 packet and receives a response, any subsequent malformed packet causes the server to crash and become unresponsive. This flaw stems from improper input validation in the server’s UDP packet handler, allowing unauthenticated remote attackers to disrupt service availability.
Affected products
-
- Version 0StatusaffectedConstraints<=0.86
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Kaillera Project | Server | unaffected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Aug 22, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (8 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.91% (0.00911) | 58.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.85% (0.00850) | 53.19th | v5 (v2026.06.15) |
| May 6, 2026 | 51.44% (0.51440) | 97.90th | v4 (v2025.03.14) |
| Jan 16, 2026 | 48.10% (0.48101) | 97.63th | v4 (v2025.03.14) |
| Dec 20, 2025 | 55.96% (0.55964) | 97.99th | v4 (v2025.03.14) |
| Oct 27, 2025 | 52.57% (0.52574) | 97.80th | v4 (v2025.03.14) |
| Oct 8, 2025 | 49.31% (0.49309) | 97.63th | v4 (v2025.03.14) |
| Aug 21, 2025 | 0.10% (0.00098) | 27.89th | v4 (v2025.03.14) |
References (4)
- http://kaillera.com/ product
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/games/kaillera.rb exploit
- https://www.exploit-db.com/exploits/17460 exploit
- https://www.vulncheck.com/advisories/kaillera-server-dos-via-malformed-udp-packet third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| http://kaillera.com/ | product | |
| https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/games/kaillera.rb | exploit | |
| https://www.exploit-db.com/exploits/17460 | exploit | |
| https://www.vulncheck.com/advisories/kaillera-server-dos-via-malformed-udp-packet | third-party-advisory |
Change history (0)
No recorded changes yet.