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01 Record

CVE-2023-38545

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it

HighPUBLISHEDCNA: hackerone
CNA base score8.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
View raw JSON

02 Description

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
78.68% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 99.5% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-10-18 03:52Z3 YR AGO
Last updated
2026-10-14 23:35Z14 DAYS AGO
Reserved
2023-07-20
Assigning CNA
hackerone
Record state
PUBLISHED
Severity
High (CVSS 8.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-787Out-of-bounds WriteBase
  • CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
Data version
5.2
Document digest
84bb571d9adc23bb283bff0ec14a386e667089f3197cf239b932965247147942

05 Affected products

VendorProductVersionsPlatforms
curlcurl8.4.0 to < 8.4.0—

06 References

07 Fixed in

AlmaLinux 9

  • curl
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • curl-minimal
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • libcurl
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • libcurl-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • libcurl-minimal
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • curl
    Fixed in 8.4.0-1
  • lib32-curl
    Fixed in 8.4.0-1
  • lib32-libcurl-compat
    Fixed in 8.4.0-1
  • lib32-libcurl-gnutls
    Fixed in 8.4.0-1
  • libcurl-compat
    Fixed in 8.4.0-1
  • libcurl-gnutls
    Fixed in 8.4.0-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 9

  • curl
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • curl-minimal
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • libcurl
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • libcurl-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2
  • libcurl-minimal
    Fixed

    A version is affected if any line below covers it.

    • Affected before 7.76.1-23.el9_2.4
    • Affected before 7.76.1-26.el9_3.2

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • curl
    Fixed in 7.88.1-10+deb12u4

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • curl
    Fixed in 8.3.0-3

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • curl
    Fixed in 8.3.0-3

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • curl
    Fixed in 7.81.0-1ubuntu1.14

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • curl
    Fixed in 8.2.1-1ubuntu3.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.