Cisco IOS XE SD-WAN vDaemon buffer 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.
9.6$5k-$25k0.00

Summaryinfo

A vulnerability was found in Cisco IOS XE SD-WAN and classified as critical. This impacts an unknown function of the component vDaemon. Such manipulation leads to buffer overflow. This vulnerability is documented as CVE-2021-34727. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco IOS XE SD-WAN (Router Operating System) (the affected version is unknown) and classified as very critical. Affected by this issue is an unknown code of the component vDaemon. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability.

The weakness was released 09/23/2021 as cisco-sa-iosxesdwan-rbuffover-vE2OB6tp. The advisory is shared for download at tools.cisco.com. This vulnerability is handled as CVE-2021-34727 since 06/15/2021. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/23/2021).

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: 9.8
VulDB Meta Temp Score: 9.6

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

CNA Base Score: 9.8
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / 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

06/15/2021 🔍
09/23/2021 +100 days 🔍
09/23/2021 +0 days 🔍
10/01/2021 +8 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-iosxesdwan-rbuffover-vE2OB6tp
Status: Confirmed

CVE: CVE-2021-34727 (🔍)
GCVE (CVE): GCVE-0-2021-34727
GCVE (VulDB): GCVE-100-183236
scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 09/23/2021 12:15
Updated: 10/01/2021 13:52
Changes: 09/23/2021 12:15 (49), 10/01/2021 13:52 (1)
Complete: 🔍
Cache ID: 216::103

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