K5n Webcalendar up to 0.9.26 privileges management

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.
7.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in K5n Webcalendar up to 0.9.26. It has been classified as critical. This issue affects some unknown processing. The manipulation leads to privileges management. This vulnerability is traded as CVE-2001-0477. There is no exploit available.

Detailsinfo

A vulnerability was found in K5n Webcalendar up to 0.9.26 (Calendar Software) and classified as critical. This issue affects an unknown code block. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Vulnerability in WebCalendar 0.9.26 allows remote command execution.

The bug was discovered 04/23/2001. The weakness was shared 06/27/2001 as not defined posting (Bugtraq). The advisory is shared at archives.neohapsis.com. The identification of this vulnerability is CVE-2001-0477. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 65 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 86261 (WebCalendar Remote Command Execution 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 X-Force (6486), SecurityFocus (BID 2639†), OSVDB (5471†) and Vulnerability Center (SBV-6504†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Calendar Software

Vendor

• K5n

Name

• Webcalendar

Version

• 0.9.8
• 0.9.11
• 0.9.15
• 0.9.16
• 0.9.19
• 0.9.20
• 0.9.21
• 0.9.22
• 0.9.23
• 0.9.24
• 0.9.25
• 0.9.26

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
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

04/23/2001 🔍
04/23/2001 +0 days 🔍
04/23/2001 +0 days 🔍
06/27/2001 +65 days 🔍
06/27/2001 +0 days 🔍
12/15/2004 +1267 days 🔍
07/04/2014 +3488 days 🔍
10/06/2025 +4112 days 🔍

Sourcesinfo

Advisory: archives.neohapsis.com
Status: Not defined

CVE: CVE-2001-0477 (🔍)
GCVE (CVE): GCVE-0-2001-0477
GCVE (VulDB): GCVE-100-16889
X-Force: 6486
SecurityFocus: 2639 - WebCalendar Remote Command Execution Vulnerability
OSVDB: 5471 - WebCalendar - Remote Command Execution Issue
Vulnerability Center: 6504 - Code Execution in WebCalendar <= 0.9.26 via Input Validation Error, High

Entryinfo

Created: 07/04/2014 17:46
Updated: 10/06/2025 07:02
Changes: 07/04/2014 17:46 (57), 06/03/2019 11:22 (3), 10/06/2025 07:02 (18)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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