Cisco ASA/Firepower Threat Defense Web Services Interface stack-based overflow

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.
7.8$5k-$25k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Cisco ASA and Firepower Threat Defense. Affected by this vulnerability is an unknown functionality of the component Web Services Interface. This manipulation causes stack-based overflow. This vulnerability is handled as CVE-2021-40118. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Cisco ASA and Firepower Threat Defense (Firewall Software) (the affected version is unknown). Affected by this vulnerability is an unknown code of the component Web Services Interface. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect availability.

The weakness was released 10/28/2021 as cisco-sa-asafdt-webvpn-dos-KSqJAKPA. The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2021-40118 since 08/25/2021. 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 07/28/2023).

Upgrading eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.8

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 8.6
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / 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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/25/2021 🔍
10/28/2021 +64 days 🔍
10/28/2021 +0 days 🔍
07/28/2023 +638 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-asafdt-webvpn-dos-KSqJAKPA
Status: Confirmed

CVE: CVE-2021-40118 (🔍)
GCVE (CVE): GCVE-0-2021-40118
GCVE (VulDB): GCVE-100-185581

Entryinfo

Created: 10/28/2021 06:26
Updated: 07/28/2023 15:09
Changes: 10/28/2021 06:26 (49), 11/01/2021 08:35 (19), 07/28/2023 15:09 (2)
Complete: 🔍
Cache ID: 216::103

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