VDB-317541 · CVE-2025-6998 · EUVD-2025-22540

Calibre Web/Autocaliweb 0.6.24 cps/string_helper.py strip_whitespaces Username redos

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.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Calibre Web and Autocaliweb 0.6.24. It has been rated as problematic. This issue affects the function strip_whitespaces of the file cps/string_helper.py. Performing a manipulation of the argument Username results in redos. This vulnerability is identified as CVE-2025-6998. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Calibre Web and Autocaliweb 0.6.24. This affects the function strip_whitespaces of the file cps/string_helper.py. The manipulation of the argument username with an unknown input leads to a redos vulnerability. CWE is classifying the issue as CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. This is going to have an impact on availability. The summary by CVE is:

ReDoS in strip_whitespaces() function in cps/string_helper.py in janeczku Calibre Web 0.6.24 (Nicolette) allows unauthenticated remote attackers to cause denial of service via specially crafted username parameter that triggers catastrophic backtracking during login. ReDoS in strip_whitespaces() function in cps/string_helper.py in gelbphoenix Autocaliweb 0.7.0 on allows unauthenticated remote attackers to cause denial of service via specially crafted username parameter that triggers catastrophic backtracking during login.

The advisory is shared at fluidattacks.com. This vulnerability is uniquely identified as CVE-2025-6998 since 07/02/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1449.003 for this issue.

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 vulnerability database at EUVD (EUVD-2025-22540). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

Version

0.6.24

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

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

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

CVSSv2info

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

Exploitinginfo

Class: Redos
CWE: CWE-1333 / CWE-400 / 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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/02/2025 CVE reserved
07/24/2025 +22 days Advisory disclosed
07/24/2025 +0 days VulDB entry created
07/25/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: fluidattacks.com
Status: Not defined

CVE: CVE-2025-6998 (🔒)
GCVE (CVE): GCVE-0-2025-6998
GCVE (VulDB): GCVE-100-317541
EUVD: 🔒

Entryinfo

Created: 07/24/2025 23:35
Updated: 07/25/2025 01:41
Changes: 07/24/2025 23:35 (66), 07/25/2025 01:41 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.