Description
A malicious server can use the FTP PASV response to trick curl 7.73.0 and earlier into connecting back to a given IP address and port, and this way potentially make curl extract information about services that are otherwise private and not disclosed, for example doing port scanning and service banner extractions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/curl/curl | 7.73.0 and earlier | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | curl | 7.74.0-1 | — |
| Debian 13 | curl | 7.74.0-1 | — |
| Debian 12 | curl | 7.74.0-1 | — |
| Debian 10 | curl | 7.64.0-4+deb10u2 | DSA-4881-1 |
| Debian 9 | curl | 7.52.1-5+deb9u13 | DLA-2500-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | curl | 7.68.0-1ubuntu2.4 | USN-4665-1 |
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.12 | USN-4665-1 |
| Ubuntu 16.04 LTS | curl | 7.47.0-1ubuntu2.18 | USN-4665-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | curl | 7.35.0-1ubuntu2.20+esm6 | USN-4665-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | curl +3 | 7.61.1-18.el8 | RHSA-2021:1610 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Core Services 1 | jbcs-httpd24 +1 | 1-18.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr +1 | 1.6.3-105.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-82.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-brotli +1 | 1.0.6-40.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 7.77.0-2.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.37-74.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-jansson +1 | 2.11-55.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_cluster-native | 1.3.16-5.Final_redhat_2.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_http2 | 1.15.7-17.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_jk +2 | 1.2.48-16.redhat_1.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_md | 1:2.0.8-36.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_security | 2.9.2-63.GA.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.37-74.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-nghttp2 +1 | 1.39.2-37.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1g-6.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl-chil | 1.0.0-5.el8jbcs | RHSA-2021:2472 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl-pkcs11 | 0.4.10-20.el8jbcs | RHSA-2021:2472 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | curl | 7.61.1-18.el8 | RLSA-2021:1610 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | curl | 7.66.0-4.11.1 | SUSE-SU-2020:3735-1 |
| SLES 15 SP1 | curl | 7.60.0-3.35.1 | SUSE-SU-2020:3733-1 |
| SLES 12 SP5 | curl | 7.60.0-11.9.1 | SUSE-SU-2020:3739-1 |
| SLES 12 SP4 | curl | 7.60.0-4.20.1 | SUSE-SU-2021:1786-1 |
| SLES 11 | curl-openssl1 | 7.37.0-70.57.1 | SUSE-SU-2020:14585-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | curl | 7.60.0-11.9.1 | SUSE-SU-2020:3739-1 |
| SLES for SAP 12 SP4 | curl | 7.60.0-4.20.1 | SUSE-SU-2021:1786-1 |
| SUSE OpenStack Cloud Crowbar 9 | curl | 7.60.0-4.20.1 | SUSE-SU-2021:1786-1 |
| SUSE OpenStack Cloud 9 | curl | 7.60.0-4.20.1 | SUSE-SU-2021:1786-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.79.1-1.1 | openSUSE-SU-2024:10582-1 |
| openSUSE Leap 15.2 | curl +1 | 7.66.0-lp152.3.12.1 | openSUSE-SU-2020:2238-1 |
| openSUSE Leap 15.1 | curl +1 | 7.60.0-lp151.5.18.1 | openSUSE-SU-2020:2249-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.74.0-r0 | — |
| Alpine v3.23 | curl | 7.74.0-r0 | — |
| Alpine v3.22 | curl | 7.74.0-r0 | — |
| Alpine v3.21 | curl | 7.74.0-r0 | — |
| Alpine v3.20 | curl | 7.74.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.74.0-r0 | — |
| Alpine v3.18 | curl | 7.74.0-r0 | — |
| Alpine v3.17 | curl | 7.74.0-r0 | — |
| Alpine v3.16 | curl | 7.74.0-r0 | — |
| Alpine v3.15 | curl | 7.74.0-r0 | — |
| Alpine v3.14 | curl | 7.74.0-r0 | — |
| Alpine v3.13 | curl | 7.74.0-r0 | — |
| Alpine v3.12 | curl | 7.74.0-r0 | — |
| Alpine v3.11 | curl | 7.79.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | curl +2 | 7.76.1-4.amzn2.0.1 | ALAS2-2021-1693 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | curl +3 | 7.61.1-18.el8 | ELSA-2021-1610 |
Advisories 26
- RHSA-2021:2472 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP8 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2021:1610 Red Hat Security Advisory: curl security and bug fix update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- USN-4665-2 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4665-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4881-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2500-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:1610 Moderate: curl security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2024:10582-1 curl-7.79.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3739-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1786-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2238-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2249-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3735-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3733-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14585-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- WID-SEC-2023-2229 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- ICSA-22-069-09 Siemens SINEC INS CISA ICS & IT advisories · May 6, 2025
- WID-SEC-2023-2098 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 10, 2024
- SSA-389290 SSA-389290: Third-Party Component Vulnerabilities in SINEC INS Siemens ProductCERT · Mar 8, 2022
- ALAS2-2021-1693 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 5, 2021
- ELSA-2021-1610 Moderate: curl security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
References
- https://hackerone.com/reports/1040166
- https://curl.se/docs/CVE-2020-8284.html
- FEDORA-2020-ceaf490686 vendor-advisory
- [debian-lts-announce] 20201219 [SECURITY] [DLA 2500-1] curl security update mailing-list
- FEDORA-2020-7ab62c73bc vendor-advisory
- GLSA-202012-14 vendor-advisory
- DSA-4881 vendor-advisory
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://security.netapp.com/advisory/ntap-20210122-0007/
- https://support.apple.com/kb/HT212325
- https://support.apple.com/kb/HT212326
- https://support.apple.com/kb/HT212327
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf