VDB-189539 · CVE-2021-41819 · Nessus 236688

Ruby up to 2.6.8 Cookie Name CGI::Cookie.parse cookie validation

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.
6.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Ruby up to 2.6.8. It has been rated as critical. This impacts the function CGI::Cookie.parse of the component Cookie Name Handler. The manipulation leads to an unknown weakness. This vulnerability is traded as CVE-2021-41819. There is no exploit available.

Detailsinfo

A vulnerability was found in Ruby up to 2.6.8 (Programming Language Software). It has been rated as critical. This issue affects the function CGI::Cookie.parse of the component Cookie Name Handler. Using CWE to declare the problem leads to CWE-565. The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user. The impact remains unknown.

The weakness was shared 01/01/2022. It is possible to read the advisory at hackerone.com. The identification of this vulnerability is CVE-2021-41819 since 09/29/2021. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 236688 (Alibaba Cloud Linux 3 : 0080: ruby:2.7 (ALINUX3-SA-2023:0080)), which helps to determine the existence of the flaw in a target environment.

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 Tenable (236688) and CERT Bund (WID-SEC-2022-0877). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

Debian Linux
Amazon Linux 2
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
Gentoo Linux
Open Source Ruby
SUSE openSUSE

Productinfo

Type

Programming Language Software

Name

Ruby

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cookie validation
CWE: CWE-565 / CWE-20
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

Nessus ID: 236688
Nessus Name: Alibaba Cloud Linux 3 : 0080: ruby:2.7 (ALINUX3-SA-2023:0080)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/29/2021 🔍
01/01/2022 +94 days 🔍
01/01/2022 +0 days 🔍
05/09/2026 +1589 days 🔍

Sourcesinfo

Advisory: hackerone.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-41819 (🔍)
GCVE (CVE): GCVE-0-2021-41819
GCVE (VulDB): GCVE-100-189539
CERT Bund: WID-SEC-2022-0877 - Ruby: Mehrere Schwachstellen

Entryinfo

Created: 01/01/2022 15:03
Updated: 05/09/2026 18:30
Changes: 01/01/2022 15:03 (37), 01/05/2022 14:29 (1), 05/17/2025 19:34 (17), 05/22/2025 20:09 (21), 05/09/2026 18:30 (7)
Complete: 🔍
Cache ID: 216::103

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