CVE-2019-12665

What it is

A vulnerability in the HTTP client feature of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to read and modify data that should normally have been sent via an encrypted channel. The vulnerability is due to TCP port information not being considered when matching new requests to existing, persistent HTTP connections. An attacker could exploit this vulnerability by acting as a man-in-the-middle and then reading and/or modifying data that should normally have been sent through an encrypted channel.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-09-25 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:15 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.1% in the next 30 days (EPSS).
• Severity: 7.4 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-09-25 21:15 UTC

Last modified

2026-06-17 02:15 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco iOS 15.6\(2\)t
• Cisco iOS fd-1.5.0

Attack profile CVSS 3.1 · 7.4

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-12665.md and follow it. Check whether this project is affected by CVE-2019-12665. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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