CVE-2009-20007Public exploitNetwork attack vector

Remote code execution via oversized IRC response

Published Sep 16, 2025 · Updated Sep 16, 2025

Stack-based buffer overflow in Infiero Premium Software Talkative IRC 0.4.4.16 allows remote attackers to execute arbitrary code. The IRC response handler accepts an oversized server-supplied prefix into fixed stack storage; public exploits use 272 filler bytes to reach and overwrite SEH. A client must connect to an attacker-controlled IRC server, and resulting code executes with the vulnerable client process's rights.

CVSS severity9.3
Critical
EPSS probability1.40%
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 Infiero Premium Software Talkative IRC 0.4.4.16 allows remote attackers to execute arbitrary code. The IRC response handler accepts an oversized server-supplied prefix into fixed stack storage; public exploits use 272 filler bytes to reach and overwrite SEH. A client must connect to an attacker-controlled IRC server, and resulting code executes with the vulnerable client process's rights.

The record

CVE
CVE-2009-20007
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
Infiero Premium Software
Product
Talkative IRC
Classifications
CWE-121, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=* <=0.4.4.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Infiero Premium Software · Talkative IRCversion=* <=0.4.4.16

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution

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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