CVE-2020-9041Network attack vector

Service interruption via slow HTTP header exhaustion

Published Jun 8, 2020 · Updated Aug 4, 2024

Slowloris denial of service in Couchbase Server 6.0.3 and Sync Gateway through 2.7.0 allows remote attackers to interrupt service. The affected REST endpoints keep partial HTTP requests open because header-read timeouts are too lenient, allowing unfinished connections to consume available capacity. No authentication or user interaction is required; sustained slow-header connections can make cluster management, views, query, and full-text search endpoints unavailable.

CVSS severity7.5
High
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Slowloris denial of service in Couchbase Server 6.0.3 and Sync Gateway through 2.7.0 allows remote attackers to interrupt service. The affected REST endpoints keep partial HTTP requests open because header-read timeouts are too lenient, allowing unfinished connections to consume available capacity. No authentication or user interaction is required; sustained slow-header connections can make cluster management, views, query, and full-text search endpoints unavailable.

The record

CVE
CVE-2020-9041
Published
Jun 8, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-404, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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