TNS Listener Poisoning Attack in Oracle Database

Published: 2012-04-18 | Updated: 2019-05-24
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2012-1675
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Oracle Database Server
Server applications / Database software

Vendor Oracle

Security Advisory

This security advisory describes one high risk vulnerability.

1) Spoofing attack

Risk: High

CVSSv3: 6.8 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:F/RL:O/RC:C] [PCI]

CVE-ID: CVE-2012-1675

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: Yes [Search exploit]


The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to an error in the TNS listener service. A remote attacker can register an existing instance or service name, use man-in-the-middle techniques and read, inject or modify transmitted data.

Successful exploitation of this vulnerability may result in unauthorized access to entire database.

Note: the vulnerability was being actively exploited.


Install update from vendor's website.

Vulnerable software versions

Oracle Database Server:,,,,,,,

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.