VDB-35107 · CVE-2007-1030 · BID 22606

Niels Provos libevent 1.2/1.2a denial of service

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.
7.5	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Niels Provos libevent 1.2/1.2a. The affected element is an unknown function. This manipulation causes denial of service. This vulnerability is tracked as CVE-2007-1030. No exploit exists.

Detailsinfo

A vulnerability was found in Niels Provos libevent 1.2/1.2a. It has been declared as critical. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Niels Provos libevent 1.2 and 1.2a allows remote attackers to cause a denial of service (infinite loop) via a DNS response containing a label pointer that references its own offset.

The weakness was disclosed 02/19/2007. This vulnerability is known as CVE-2007-1030. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 123594 (Libevent DNS Parsing Denial Of Service Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at SecurityFocus (BID 22606†), OSVDB (33228†) and Vulnerability Center (SBV-54425†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Niels Provos

Name

libevent

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.5
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/18/2007 🔍
02/18/2007 +0 days 🔍
02/19/2007 +1 days 🔍
02/19/2007 +0 days 🔍
02/20/2007 +0 days 🔍
02/21/2007 +1 days 🔍
03/13/2015 +2942 days 🔍
11/16/2015 +248 days 🔍
06/09/2025 +3493 days 🔍

Sourcesinfo

Status: Not defined
Confirmation: 🔍

CVE: CVE-2007-1030 (🔍)
GCVE (CVE): GCVE-0-2007-1030
GCVE (VulDB): GCVE-100-35107
SecurityFocus: 22606
OSVDB: 33228 - libevent Malformed DNS Response DoS
Vulnerability Center: 54425 - Niels Provos Libevent 1.2 and 1.2a Remote DoS via a DNS Response, High

Entryinfo

Created: 03/13/2015 12:16
Updated: 06/09/2025 09:55
Changes: 03/13/2015 12:16 (36), 11/19/2015 11:37 (10), 07/13/2021 13:58 (3), 07/13/2021 14:04 (7), 07/13/2021 14:10 (2), 06/09/2025 09:55 (16)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.