CVE-2025-0665Network attack vector

Process instability via eventfd double close

Published Feb 5, 2025 · Updated Mar 17, 2026

Resource-management error in libcurl for curl 8.11.1 allows remote attackers to destabilize processes after threaded name resolution. An incorrect conditional leaves socketpair-era cleanup in place, so connection teardown closes the inter-thread eventfd twice. The flaw requires a 64-bit eventfd build with the threaded resolver, and the closely spaced close calls constrain control over a reused descriptor.

CVSS severity7.0
High
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-management error in libcurl for curl 8.11.1 allows remote attackers to destabilize processes after threaded name resolution. An incorrect conditional leaves socketpair-era cleanup in place, so connection teardown closes the inter-thread eventfd twice. The flaw requires a 64-bit eventfd build with the threaded resolver, and the closely spaced close calls constrain control over a reused descriptor.

The record

CVE
CVE-2025-0665
Published
Feb 5, 2025
Updated
Mar 17, 2026
Vendor
curl
Product
curl
Classifications
CWE-1341, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.11.1 <=8.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=8.11.1 <=8.11.1

Published CVSS scores

3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
7.0CISA ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1341Multiple Releases of Same Resource or Handle
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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