VDB-170381 · CVE-2021-27645 · GCVE-0-2021-27645

GNU C Library 2.29/2.30/2.31/2.32/2.33 nscd netgroupcache.c double free

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.
3.9	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in GNU C Library 2.29/2.30/2.31/2.32/2.33. This affects an unknown part of the file netgroupcache.c of the component nscd. The manipulation leads to double free. This vulnerability is documented as CVE-2021-27645. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in GNU C Library 2.29/2.30/2.31/2.32/2.33 (Software Library). This issue affects an unknown functionality of the file netgroupcache.c of the component nscd. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is availability.

The weakness was released 02/25/2021. The advisory is shared at sourceware.org. The identification of this vulnerability is CVE-2021-27645. Technical details are known, but no exploit is available.

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

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Productinfo

Type

Software Library

Vendor

Name

C Library

Version

License

open-source

Website

Vendor: https://www.gnu.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.9
VulDB Meta Temp Score: 3.9

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

NVD Base Score: 2.5
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: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
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

02/24/2021 🔍
02/25/2021 +1 days 🔍
02/25/2021 +0 days 🔍
06/09/2025 +1565 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: sourceware.org
Status: Not defined

CVE: CVE-2021-27645 (🔍)
GCVE (CVE): GCVE-0-2021-27645
GCVE (VulDB): GCVE-100-170381

Entryinfo

Created: 02/25/2021 06:46
Updated: 06/09/2025 18:01
Changes: 02/25/2021 06:46 (38), 03/05/2021 00:57 (2), 03/05/2021 01:01 (18), 06/09/2025 18:01 (15)
Complete: 🔍
Cache ID: 216:EAE:103