Description
A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/curl/curl | curl 7.20.0 to and including 7.78.0 | — |
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 | 7.79.1-1 | — |
| Debian 13 | curl | 7.79.1-1 | — |
| Debian 12 | curl | 7.79.1-1 | — |
| Debian 11 | curl | 7.74.0-1.3+deb11u2 | DSA-5197-1 |
| Debian 10 | curl | 7.64.0-4+deb10u3 | DLA-3085-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | curl | 7.52.1-5+deb9u16 | DLA-2773-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | curl | 7.74.0-1.3ubuntu2 | — |
| Ubuntu 20.04 LTS | curl | 7.68.0-1ubuntu2.7 | USN-5079-1 |
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.15 | USN-5079-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | curl | 7.47.0-1ubuntu2.19+esm1 | USN-5079-2 |
| Ubuntu Pro 14.04 LTS | curl | 7.35.0-1ubuntu2.20+esm8 | USN-5079-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | curl +3 | 7.61.1-18.el8_4.2 | RHSA-2021:4059 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Dotnet 3 | rh-dotnet31-curl +2 | 7.61.1-22.el7_9 | RHSA-2022:1354 |
| RHEL 8.2 EUS | curl +3 | 7.61.1-12.el8_2.4 | RHSA-2022:0635 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | curl | 7.61.1-18.el8_4.2 | RLSA-2021:4059 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | curl | 7.66.0-4.27.1 | SUSE-SU-2021:3298-1 |
| SLES 15 SP2 | curl | 7.66.0-4.27.1 | SUSE-SU-2021:3298-1 |
| SLES 15 SP1 | curl | 7.60.0-25.1 | SUSE-SU-2021:3297-1 |
| SLES 15 | curl | 7.60.0-25.1 | SUSE-SU-2021:3297-1 |
| SLES 12 SP5 | curl | 7.60.0-11.28.1 | SUSE-SU-2021:3332-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | curl | 7.60.0-4.30.1 | SUSE-SU-2021:3351-1 |
| SLES 11 | curl-openssl1 | 7.37.0-70.74.1 | SUSE-SU-2021:14807-1 |
| SLES for SAP 15 SP1 | curl | 7.60.0-25.1 | SUSE-SU-2021:3297-1 |
| SLES for SAP 15 | curl | 7.60.0-25.1 | SUSE-SU-2021:3297-1 |
| SLES for SAP 12 SP5 | curl | 7.60.0-11.28.1 | SUSE-SU-2021:3332-1 |
| SLES for SAP 12 SP4 | curl | 7.60.0-4.30.1 | SUSE-SU-2021:3351-1 |
| SLE Micro 5.1 | curl | 7.66.0-4.27.1 | SUSE-SU-2021:3298-1 |
| SLE Micro 5.0 | curl | 7.66.0-4.27.1 | SUSE-SU-2021:3298-1 |
| SLE HPC 15 SP1 | curl | 7.60.0-25.1 | SUSE-SU-2021:3297-1 |
| SLE HPC 15 | curl | 7.60.0-25.1 | SUSE-SU-2021:3297-1 |
| SUSE OpenStack Cloud Crowbar 9 | curl | 7.60.0-4.30.1 | SUSE-SU-2021:3351-1 |
| SUSE OpenStack Cloud 9 | curl | 7.60.0-4.30.1 | SUSE-SU-2021:3351-1 |
| SUSE Enterprise Storage 6 | curl | 7.60.0-25.1 | SUSE-SU-2021:3297-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.79.1-1.1 | openSUSE-SU-2024:10582-1 |
| openSUSE Leap 15.3 | curl | 7.66.0-4.27.1 | openSUSE-SU-2021:3298-1 |
| openSUSE Leap 15.2 | curl +1 | 7.66.0-lp152.3.24.1 | openSUSE-SU-2021:1384-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.79.0-r0 | — |
| Alpine v3.23 | curl | 7.79.0-r0 | — |
| Alpine v3.22 | curl | 7.79.0-r0 | — |
| Alpine v3.21 | curl | 7.79.0-r0 | — |
| Alpine v3.20 | curl | 7.79.0-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.79.0-r0 | — |
| Alpine v3.18 | curl | 7.79.0-r0 | — |
| Alpine v3.17 | curl | 7.79.0-r0 | — |
| Alpine v3.16 | curl | 7.79.0-r0 | — |
| Alpine v3.15 | curl | 7.79.0-r0 | — |
| Alpine v3.14 | curl | 7.79.0-r0 | — |
| Alpine v3.13 | curl | 7.79.0-r0 | — |
| Alpine v3.12 | curl | 7.79.0-r0 | — |
| Alpine v3.11 | curl | 7.79.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | curl +2 | 7.79.1-1.amzn2.0.1 | ALAS2-2021-1724 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | curl | 7.82.0-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | curl +3 | 7.61.1-18.el8_4.2 | ELSA-2021-4059 |
Advisories 34
- 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
- RHSA-2022:1354 Red Hat Security Advisory: rh-dotnet31-curl security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- USN-5079-2 curl vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- RHSA-2022:0635 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2021:4059 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-5079-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5197-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2773-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3085-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:4059 Moderate: curl security 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-2021:3351-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3298-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14807-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3332-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1384-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3298-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3297-1 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
- WID-SEC-2022-0875 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 6, 2025
- WID-SEC-2022-1335 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- VDE-2022-010 PHOENIX CONTACT: Multiple Linux component vulnerabilities fixed in latest AXC F x152 LTS release CERT@VDE · May 22, 2025
- ICSA-23-194-01 Siemens RUGGEDCOM ROX CISA ICS & IT advisories · May 6, 2025
- ICSA-22-069-09 Siemens SINEC INS CISA ICS & IT advisories · May 6, 2025
- SSA-146325 SSA-146325: Multiple Vulnerabilities in RUGGEDCOM ROX before V2.16 Siemens ProductCERT · Jul 11, 2023
- WID-SEC-2022-1056 Apple macOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 21, 2023
- WID-SEC-2022-1461 IBM Spectrum Protect: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 20, 2023
- WID-SEC-2022-0676 Juniper Junos Space: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 11, 2023
- SSA-389290 SSA-389290: Third-Party Component Vulnerabilities in SINEC INS Siemens ProductCERT · Mar 8, 2022
- ALAS2-2021-1724 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 9, 2021
- ELSA-2021-4059 Moderate: curl security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 2, 2021
References
- https://hackerone.com/reports/1334111
- [debian-lts-announce] 20210930 [SECURITY] [DLA 2773-1] curl security update mailing-list
- FEDORA-2021-fc96a3a749 vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.html
- FEDORA-2021-1d24845e93 vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://security.netapp.com/advisory/ntap-20211029-0003/
- https://security.netapp.com/advisory/ntap-20220121-0008/
- 20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3 mailing-list
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://support.apple.com/kb/HT213183
- https://www.oracle.com/security-alerts/cpujul2022.html
- DSA-5197 vendor-advisory
- [debian-lts-announce] 20220828 [SECURITY] [DLA 3085-1] curl security update mailing-list
- GLSA-202212-01 vendor-advisory