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Vulnerability details: VCID-age7-hx9p-fya2
Vulnerability ID VCID-age7-hx9p-fya2
Aliases CVE-2018-1000120
GHSA-674j-7m97-j2p9
Summary curl FTP path confusion leads to NIL byte out of bounds write curl can be coerced into writing a zero byte out of bounds. This bug can trigger when curl is told to work on an FTP URL, with the setting to only issue a single CWD command (--ftp-method singlecwd or the libcurl alternative [CURLOPT_FTP_FILEMETHOD](https://curl.se/libcurl/c/CURLOPT_FTP_FILEMETHOD.html)). curl then URL-decodes the given path, calls strlen() on the result and deducts the length of the file name part to find the end of the directory within the buffer. It then writes a zero byte on that index, in a buffer allocated on the heap. If the directory part of the URL contains a `%00` sequence, the directory length might end up shorter than the file name path, making the calculation `size_t index = directory_len - filepart_len` end up with a huge index variable for where the zero byte gets stored: `heap_buffer[index] = 0`. On several architectures that huge index will wrap and work as a negative value, thus overwriting memory before the intended heap buffer. By using different file part lengths and putting the string `%00` in different places in the URL, an attacker that can control what paths a curl-using application uses can write that zero byte on different indexes.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-787 Out-of-bounds Write
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-122 Heap-based Buffer Overflow
System Score Found at
cvssv3.1 9.8 https://access.redhat.com/errata/RHBA-2019:0327
generic_textual CRITICAL https://access.redhat.com/errata/RHBA-2019:0327
cvssv3.1 9.8 https://access.redhat.com/errata/RHSA-2018:3157
generic_textual CRITICAL https://access.redhat.com/errata/RHSA-2018:3157
cvssv3.1 9.8 https://access.redhat.com/errata/RHSA-2018:3558
generic_textual CRITICAL https://access.redhat.com/errata/RHSA-2018:3558
cvssv3.1 9.8 https://access.redhat.com/errata/RHSA-2019:1543
generic_textual CRITICAL https://access.redhat.com/errata/RHSA-2019:1543
cvssv3.1 9.8 https://access.redhat.com/errata/RHSA-2020:0544
generic_textual CRITICAL https://access.redhat.com/errata/RHSA-2020:0544
cvssv3.1 9.8 https://access.redhat.com/errata/RHSA-2020:0594
generic_textual CRITICAL https://access.redhat.com/errata/RHSA-2020:0594
cvssv3 5.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-1000120.json
epss 0.01298 https://api.first.org/data/v1/epss?cve=CVE-2018-1000120
cvssv3.1 9.8 https://curl.haxx.se/docs/adv_2018-9cd6.html
generic_textual CRITICAL https://curl.haxx.se/docs/adv_2018-9cd6.html
cvssv3.1 9.8 https://curl.se/docs/CVE-2018-1000120.html
cvssv3.1 High https://curl.se/docs/CVE-2018-1000120.html
generic_textual CRITICAL https://curl.se/docs/CVE-2018-1000120.html
cvssv3 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 9.8 https://github.com/coapp-packages/curl
generic_textual CRITICAL https://github.com/coapp-packages/curl
cvssv3.1 9.8 https://lists.debian.org/debian-lts-announce/2018/03/msg00012.html
generic_textual CRITICAL https://lists.debian.org/debian-lts-announce/2018/03/msg00012.html
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2018-1000120
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2018-1000120
archlinux Medium https://security.archlinux.org/AVG-653
archlinux Medium https://security.archlinux.org/AVG-654
archlinux Medium https://security.archlinux.org/AVG-655
archlinux Medium https://security.archlinux.org/AVG-656
archlinux Medium https://security.archlinux.org/AVG-660
archlinux Medium https://security.archlinux.org/AVG-661
cvssv3.1 9.8 https://usn.ubuntu.com/3598-1
generic_textual CRITICAL https://usn.ubuntu.com/3598-1
cvssv3.1 9.8 https://usn.ubuntu.com/3598-2
generic_textual CRITICAL https://usn.ubuntu.com/3598-2
cvssv3.1 9.8 https://web.archive.org/web/20201220134105/http://www.securitytracker.com/id/1040531
generic_textual CRITICAL https://web.archive.org/web/20201220134105/http://www.securitytracker.com/id/1040531
cvssv3.1 9.8 https://web.archive.org/web/20201220134609/http://www.securityfocus.com/bid/103414
generic_textual CRITICAL https://web.archive.org/web/20201220134609/http://www.securityfocus.com/bid/103414
cvssv3.1 9.8 https://www.debian.org/security/2018/dsa-4136
generic_textual CRITICAL https://www.debian.org/security/2018/dsa-4136
cvssv3.1 9.8 https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
generic_textual CRITICAL https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
cvssv3.1 9.8 https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
generic_textual CRITICAL https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
cvssv3.1 9.8 https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
generic_textual CRITICAL https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
cvssv3.1 9.8 http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
generic_textual CRITICAL http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
cvssv3.1 9.8 http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
generic_textual CRITICAL http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
Reference id Reference type URL
https://access.redhat.com/errata/RHBA-2019:0327
https://access.redhat.com/errata/RHSA-2018:3157
https://access.redhat.com/errata/RHSA-2018:3558
https://access.redhat.com/errata/RHSA-2019:1543
https://access.redhat.com/errata/RHSA-2020:0544
https://access.redhat.com/errata/RHSA-2020:0594
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-1000120.json
https://api.first.org/data/v1/epss?cve=CVE-2018-1000120
https://curl.haxx.se/docs/adv_2018-9cd6.html
https://curl.se/docs/CVE-2018-1000120.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000120
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000121
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000122
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/coapp-packages/curl
https://lists.debian.org/debian-lts-announce/2018/03/msg00012.html
https://nvd.nist.gov/vuln/detail/CVE-2018-1000120
https://usn.ubuntu.com/3598-1
https://usn.ubuntu.com/3598-1/
https://usn.ubuntu.com/3598-2
https://usn.ubuntu.com/3598-2/
https://web.archive.org/web/20201220134105/http://www.securitytracker.com/id/1040531
https://web.archive.org/web/20201220134609/http://www.securityfocus.com/bid/103414
https://www.debian.org/security/2018/dsa-4136
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
1552628 https://bugzilla.redhat.com/show_bug.cgi?id=1552628
893546 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=893546
ASA-201803-15 https://security.archlinux.org/ASA-201803-15
ASA-201803-16 https://security.archlinux.org/ASA-201803-16
ASA-201803-17 https://security.archlinux.org/ASA-201803-17
ASA-201803-18 https://security.archlinux.org/ASA-201803-18
ASA-201803-19 https://security.archlinux.org/ASA-201803-19
ASA-201803-20 https://security.archlinux.org/ASA-201803-20
AVG-653 https://security.archlinux.org/AVG-653
AVG-654 https://security.archlinux.org/AVG-654
AVG-655 https://security.archlinux.org/AVG-655
AVG-656 https://security.archlinux.org/AVG-656
AVG-660 https://security.archlinux.org/AVG-660
AVG-661 https://security.archlinux.org/AVG-661
GHSA-674j-7m97-j2p9 https://github.com/advisories/GHSA-674j-7m97-j2p9
GLSA-201804-04 https://security.gentoo.org/glsa/201804-04
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/errata/RHBA-2019:0327
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/errata/RHSA-2018:3157
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/errata/RHSA-2018:3558
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/errata/RHSA-2019:1543
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/errata/RHSA-2020:0544
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/errata/RHSA-2020:0594
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-1000120.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://curl.haxx.se/docs/adv_2018-9cd6.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://curl.se/docs/CVE-2018-1000120.html
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/coapp-packages/curl
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://lists.debian.org/debian-lts-announce/2018/03/msg00012.html
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-1000120
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://usn.ubuntu.com/3598-1
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://usn.ubuntu.com/3598-2
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://web.archive.org/web/20201220134105/http://www.securitytracker.com/id/1040531
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://web.archive.org/web/20201220134609/http://www.securityfocus.com/bid/103414
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.debian.org/security/2018/dsa-4136
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.80025
EPSS Score 0.01298
Published At May 29, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-29T09:36:42.832445+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-674j-7m97-j2p9/GHSA-674j-7m97-j2p9.json 38.6.0