---
id: CVE-2023-27534
title: >-
  A path traversal vulnerability exists in curl <8.0.0 SFTP implementation
  causes the tilde (~) character to be wrongly replaced when used as a prefix in
  the first path element, in addition to its intended use as the first element
  to indic…
summary: >-
  A path traversal vulnerability exists in curl <8.0.0 SFTP implementation
  causes the tilde (~) character to be wrongly replaced when used as a prefix in
  the first path element, in addition to its intended use as the first element
  to indic…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-22
vendor: haxx
product: curl
affected:
  - 'curl >= 7.18.0, <= 7.88.1'
  - fedora = 36
  - active_iq_unified_manager
  - brocade_fabric_operating_system_firmware
  - h300s_firmware
  - h500s_firmware
  - h700s_firmware
  - h410s_firmware
  - 'universal_forwarder >= 8.2.0, < 8.2.12'
  - 'universal_forwarder >= 9.0.0, < 9.0.6'
  - universal_forwarder = 9.1.0
patched:
  - universal_forwarder 9.0.6
published: '2023-03-30'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T23:17:16.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-27534'
references:
  - url: 'https://hackerone.com/reports/1892351'
    label: support@hackerone.com
  - url: 'https://lists.debian.org/debian-lts-announce/2024/03/msg00016.html'
    label: support@hackerone.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
    label: support@hackerone.com
  - url: 'https://security.gentoo.org/glsa/202310-12'
    label: support@hackerone.com
  - url: 'https://security.netapp.com/advisory/ntap-20230420-0012/'
    label: support@hackerone.com
  - url: 'https://hackerone.com/reports/1892351'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/03/msg00016.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202310-12'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20230420-0012/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-806742.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-943925.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-27534.json
  - url: 'https://access.redhat.com/security/cve/CVE-2023-27534'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2179069'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2023-27534'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-27534'
  - url: 'https://curl.se/docs/CVE-2023-27534.html'
  - url: 'https://access.redhat.com/errata/RHSA-2023:3354'
  - url: 'https://access.redhat.com/errata/RHSA-2023:6679'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - exploit-available
  - score-dispute
epss: 0.0244
epssPercentile: 0.84216
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-04-23T13:29:22.277594Z'
scores:
  nvd: 8.8
  vendor: 3.7
  adp: 8.8
ingestedAt: '2026-09-18T15:44:31.588Z'
---

## Overview

A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as the first element to indicate a path relative to the user's home directory. Attackers can exploit this flaw to bypass filtering or execute arbitrary code by crafting a path like /~2/foo while accessing a server with a specific user.

## Affected

- `curl >= 7.18.0, <= 7.88.1`
- `fedora = 36`
- `active_iq_unified_manager`
- `brocade_fabric_operating_system_firmware`
- `h300s_firmware`
- `h500s_firmware`
- `h700s_firmware`
- `h410s_firmware`
- `universal_forwarder >= 8.2.0, < 8.2.12`
- `universal_forwarder >= 9.0.0, < 9.0.6`
- `universal_forwarder = 9.1.0`

## Remediation

Upgrade past the affected range:

- `universal_forwarder 9.0.6`

## Vendor advisories

- **RHSA-2023:3354** · Red Hat · fixed in: Red Hat JBoss Core Services on RHEL 7 Server, Red Hat JBoss Core Services on RHEL 8 · released 2023-06-05 · [advisory](https://access.redhat.com/errata/RHSA-2023:3354)
- **RHSA-2023:6679** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2023-11-07 · [advisory](https://access.redhat.com/errata/RHSA-2023:6679)
- **Red Hat VEX** · Low · affected: .NET Core 3.1 on Red Hat Enterprise Linux, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 · no fix planned: .NET Core 3.1 on Red Hat Enterprise Linux, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-27534.json)