CVE-2004-1464
KEVCisco IOS Denial-of-Service Vulnerability
Description
Cisco IOS contains an unspecified vulnerability that may block further telnet, reverse telnet, Remote Shell (RSH), Secure Shell (SSH), and in some cases, Hypertext Transport Protocol (HTTP) access to the Cisco device.
Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HPublishedDec 31, 2004
Last modifiedJun 16, 2026
Added to KEVMay 19, 2023
Remediation dueJun 9, 2023
References
- secunia.com/advisories/12395/Broken LinkVendor Advisory
- securitytracker.com/id?1011079Broken LinkThird Party Advisory
- cisco.com/warp/public/707/cisco-sa-20040827-telnet.shtmlNot ApplicableVendor Advisory
- kb.cert.org/vuls/id/384230PatchThird Party Advisory
- securityfocus.com/bid/11060Broken LinkThird Party Advisory
- exchange.xforce.ibmcloud.com/vulnerabilities/17131Third Party AdvisoryVDB Entry
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2004-1464US Government Resource
0 recent articles mention this CVE
60
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1235 days
- CVSS
- 5.9 MEDIUM
- EPSS (30-day exploit probability)
- 4.8% · top 8% of all CVEs
- Weakness
- CWE-400
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.