# CVE-2009-20007

## Summary

- **CVE ID:** CVE-2009-20007
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-121
- **Published:** Sep 16, 2025
- **Last Modified:** May 15, 2026

## Description

Talkative IRC v0.4.4.16 is vulnerable to a stack-based buffer overflow when processing specially crafted response strings sent to a connected client. An attacker can exploit this flaw by sending an overly long message that overflows a fixed-length buffer, potentially leading to arbitrary code execution in the context of the vulnerable process. This vulnerability is exploitable remotely and does not require authentication.

## Affected Products

- Talkative — Talkative IRC (*)
- Talkative — Talkative IRC (0)

## References

- [CNA](https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/misc/talkative_response.rb)
- [CNA](https://www.exploit-db.com/exploits/8227)
- [CNA](https://www.exploit-db.com/exploits/16459)
- [CNA](https://www.zeroscience.mk/en/vulnerabilities/ZSL-2009-4909.php)
- [CNA](https://web.archive.org/web/20090116203306/http://www.talkative-irc.com/)
- [CNA](https://www.vulncheck.com/advisories/talkative-irc-response-buffer-overflow)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 59.75%
- **EPSS Percentile:** 98.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._