Cisco Router Cisco Discovery Protocol information disclosure

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Cisco Router and classified as problematic. This issue affects some unknown processing of the component Cisco Discovery Protocol Handler. Executing a manipulation can lead to information disclosure. This vulnerability is handled as CVE-1999-0453. Additionally, an exploit exists. This vulnerability is notable in history due to its background and the response it received. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability was found in Cisco Router (Router Operating System) (the affected version is unknown). It has been declared as problematic. This vulnerability affects an unknown code of the component Cisco Discovery Protocol Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).

The weakness was released 01/01/1999. This vulnerability was named CVE-1999-0453. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available. The structure of the vulnerability defines a possible price range of USD at the moment (estimation calculated on 04/17/2026). This vulnerability is assigned to T1592 by the MITRE ATT&CK project. This vulnerability has a historic impact due to its background and reception.

It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k.

Proper firewalling of tcp/1999 (cdp) is able to address this issue.

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Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.7

VulDB Base Score: 5.3
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Firewalling: 🔍

Timelineinfo

01/01/1999 🔍
01/01/1999 +0 days 🔍
06/19/2014 +5648 days 🔍
04/17/2026 +4320 days 🔍

Sourcesinfo

Vendor: cisco.com

Status: Not defined

CVE: CVE-1999-0453 (🔍)
GCVE (CVE): GCVE-0-1999-0453
GCVE (VulDB): GCVE-100-14326
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/20/2014 00:35
Updated: 04/17/2026 21:05
Changes: 06/20/2014 00:35 (38), 04/04/2019 00:08 (10), 04/17/2026 21:05 (20)
Complete: 🔍
Cache ID: 216::103

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