VDB-181445 · CVE-2021-32780 · GCVE-0-2021-32780

Envoy up to 1.18.3/1.19.0 H2 Connection SETTINGS_MAX_CONCURRENT_STREAMS unusual condition

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 was found in Envoy up to 1.18.3/1.19.0. It has been classified as problematic. Affected by this vulnerability is an unknown functionality of the component H2 Connection Handler. The manipulation of the argument SETTINGS_MAX_CONCURRENT_STREAMS leads to unusual condition. This vulnerability is referenced as CVE-2021-32780. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Envoy up to 1.18.3/1.19.0 and classified as problematic. This issue affects an unknown code block of the component H2 Connection Handler. The manipulation of the argument SETTINGS_MAX_CONCURRENT_STREAMS with an unknown input leads to a unusual condition vulnerability. Using CWE to declare the problem leads to CWE-754. The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product. Impacted is availability.

The weakness was published 08/25/2021. The advisory is shared at github.com. The identification of this vulnerability is CVE-2021-32780. Technical details are known, but no exploit is available.

Upgrading to version 1.18.4 or 1.19.1 eliminates this vulnerability. The upgrade is hosted for download at envoyproxy.io.

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Productinfo

Name

Envoy

Version

License

free

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
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Unusual condition
CWE: CWE-754
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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Envoy 1.18.4/1.19.1

Timelineinfo

05/12/2021 🔍
08/25/2021 +105 days 🔍
08/25/2021 +0 days 🔍
08/29/2021 +4 days 🔍

Sourcesinfo

Advisory: github.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-32780 (🔍)
GCVE (CVE): GCVE-0-2021-32780
GCVE (VulDB): GCVE-100-181445

Entryinfo

Created: 08/25/2021 11:32
Updated: 08/29/2021 08:22
Changes: 08/25/2021 11:32 (39), 08/29/2021 08:19 (3), 08/29/2021 08:22 (1)
Complete: 🔍
Cache ID: 216::103