VDB-182435 · CVE-2021-40839 · GCVE-0-2021-40839

rencode up to 1.0.6 on Python Typecode Decoding infinite loop

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in rencode up to 1.0.6 on Python. Affected by this vulnerability is an unknown functionality of the component Typecode Decoding. The manipulation leads to infinite loop. This vulnerability is referenced as CVE-2021-40839. Remote exploitation of the attack is possible. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in rencode up to 1.0.6 on Python and classified as problematic. This issue affects an unknown functionality of the component Typecode Decoding. The manipulation with an unknown input leads to a infinite loop vulnerability. Using CWE to declare the problem leads to CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. Impacted is availability.

The weakness was published 09/10/2021 as 572ff74586d9b1daab904c6f7f7009ce0143bb75. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2021-40839 since 09/10/2021. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

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

Productinfo

Name

rencode

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

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: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / 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: Patch
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

09/10/2021 🔍
09/10/2021 +0 days 🔍
09/10/2021 +0 days 🔍
09/12/2021 +2 days 🔍

Sourcesinfo

Advisory: 572ff74586d9b1daab904c6f7f7009ce0143bb75
Status: Confirmed

CVE: CVE-2021-40839 (🔍)
GCVE (CVE): GCVE-0-2021-40839
GCVE (VulDB): GCVE-100-182435

Entryinfo

Created: 09/10/2021 13:26
Updated: 09/12/2021 20:10
Changes: 09/10/2021 13:26 (40), 09/12/2021 20:10 (1)
Complete: 🔍
Cache ID: 216::103