Oracle Communications Cloud Native Core Binding Support Function BSF out-of-bounds write

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.
9.6$5k-$25k0.00

Summaryinfo

A vulnerability identified as very critical has been detected in Oracle Communications Cloud Native Core Binding Support Function 1.11.0. This issue affects some unknown processing of the component BSF. This manipulation causes an unknown weakness. This vulnerability appears as CVE-2021-43527. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Oracle Communications Cloud Native Core Binding Support Function 1.11.0 (Cloud Software). It has been declared as very critical. Affected by this vulnerability is some unknown functionality of the component BSF. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was presented 04/19/2022 as Oracle Critical Patch Update Advisory - April 2022. The advisory is shared at oracle.com. This vulnerability is known as CVE-2021-43527. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/16/2025).

We expect the 0-day to have been worth approximately $100k and more. The vulnerability scanner Nessus provides a plugin with the ID 236713 (Alibaba Cloud Linux 3 : 0081: nss (ALINUX3-SA-2021:0081)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236713). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 236713
Nessus Name: Alibaba Cloud Linux 3 : 0081: nss (ALINUX3-SA-2021:0081)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

11/08/2021 🔍
04/19/2022 +161 days 🔍
04/19/2022 +0 days 🔍
04/20/2022 +1 days 🔍
05/16/2025 +1122 days 🔍

Sourcesinfo

Vendor: oracle.com

Advisory: Oracle Critical Patch Update Advisory - April 2022
Status: Confirmed

CVE: CVE-2021-43527 (🔍)
GCVE (CVE): GCVE-0-2021-43527
GCVE (VulDB): GCVE-100-197773

Entryinfo

Created: 04/20/2022 07:59
Updated: 05/16/2025 19:58
Changes: 04/20/2022 07:59 (39), 04/23/2022 02:23 (2), 04/23/2022 02:31 (18), 05/16/2025 19:58 (16)
Complete: 🔍
Cache ID: 216::103

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

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