CVE catalog
CVE-2021-22901
curl: CVE-2021-22901
- Severity
- High · CVSS 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 63.53% · Oct 25, 2026
curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | curl | sid | 8.23.0-1 | not affected |
| Debian | curl | forky | 8.22.0-1 | not affected |
| Debian | curl | trixie | 8.14.1-2+deb13u5 | not affected |
| Debian | curl | trixie-security | 8.14.1-2+deb13u7 | not affected |
| Debian | curl | bookworm | 7.88.1-10+deb12u15 | not affected |
| Debian | curl | bookworm-security | 7.88.1-10+deb12u5 | not affected |
| Cpe | curl | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_binding_support_function | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_network_function_cloud_native_environment | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_network_repository_function | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_network_slice_selection_function | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_service_communication_proxy | Not reported | Not reported | unknown |
| Cpe | essbase | Not reported | 21.3 | fixed |
| Cpe | mysql_server | Not reported | Not reported | unknown |
| Cpe | active_iq_unified_manager | Not reported | Not reported | unknown |
| Cpe | cloud_backup | Not reported | Not reported | unknown |
| Cpe | oncommand_insight | Not reported | Not reported | unknown |
| Cpe | oncommand_workflow_automation | Not reported | Not reported | unknown |
| Cpe | snapcenter | Not reported | Not reported | unknown |
| Cpe | solidfire\,_enterprise_sds_\&_hci_storage_node | Not reported | Not reported | unknown |
| Cpe | solidfire_\&_hci_management_node | Not reported | Not reported | unknown |
| Cpe | solidfire_baseboard_management_controller_firmware | Not reported | Not reported | unknown |
| Alpine | curl | 3.12 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.13 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.14 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.15 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.16 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.17 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.18 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.19 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.20 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.21 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.22 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.23 | 7.77.0-r0 | fixed |
| Alpine | curl | 3.24 | 7.77.0-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | curl | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | curl | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | curl | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | curl | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | essbase | cpe | Not reported | 21.3 | Not reported | NVD-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.12 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.13 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.14 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.15 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.16 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.17 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.18 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.19 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.20 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.21 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.22 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.23 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
| Alpine | curl | apk | 3.24 | 7.77.0-r0 | Not reported | ALPINE-CVE-2021-22901 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [curl]Unknown
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
- [libcurl3-gnutls]Unknown
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
- [libcurl3-nss]Unknown
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
- [libcurl4]Unknown
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
- [libcurl4-doc]Unknown
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· all · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· all · bookwormNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· all · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· all · bookworm-securityNot affected
dsa · curl · debian · bookworm
- [libcurl4-gnutls-dev]Unknown
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
- [libcurl4-nss-dev]Unknown
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
- [libcurl4-openssl-dev]Unknown
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
dsa · curl · debian · bookworm
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-732250.json]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2024_10582-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2021-22901]
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-22901]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-22901]
- [https://security-tracker.debian.org/tracker/CVE-2021-22901]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-22901.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-1350.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]