h2c Package MaxBytesHandler request smuggling

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in h2c Package. It has been declared as critical. This affects the function MaxBytesHandler. Such manipulation leads to request smuggling. This vulnerability is documented as CVE-2022-41721. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in h2c Package (version now known) and classified as critical. Affected by this issue is the function MaxBytesHandler. The manipulation with an unknown input leads to a request smuggling vulnerability. Using CWE to declare the problem leads to CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A request smuggling attack is possible when using MaxBytesHandler. When using MaxBytesHandler, the body of an HTTP request is not fully consumed. When the server attempts to read HTTP2 frames from the connection, it will instead be reading the body of the HTTP request, which could be attacker-manipulated to represent arbitrary HTTP2 requests.

The weakness was released 01/14/2023. The advisory is shared for download at go.dev. This vulnerability is handled as CVE-2022-41721 since 09/28/2022. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/04/2025).

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

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Request smuggling
CWE: CWE-444
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/28/2022 🔍
01/14/2023 +108 days 🔍
01/14/2023 +0 days 🔍
04/04/2025 +811 days 🔍

Sourcesinfo

Advisory: go.dev
Status: Confirmed

CVE: CVE-2022-41721 (🔍)
GCVE (CVE): GCVE-0-2022-41721
GCVE (VulDB): GCVE-100-218336

Entryinfo

Created: 01/14/2023 09:00
Updated: 04/04/2025 20:21
Changes: 01/14/2023 09:00 (35), 02/07/2023 10:07 (11), 04/04/2025 20:21 (16)
Complete: 🔍
Cache ID: 216::103

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