CVE catalog

CVE-2021-22890

curl: CVE-2021-22890

Severity: Low · CVSS 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Published: Mar 30, 2021, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 3.06% · Oct 25, 2026

curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.

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`	fixed
Debian	curl	forky	`8.22.0-1`	fixed
Debian	curl	trixie	`8.14.1-2+deb13u5`	fixed
Debian	curl	trixie-security	`8.14.1-2+deb13u7`	fixed
Debian	curl	bookworm	`7.88.1-10+deb12u15`	fixed
Debian	curl	bookworm-security	`7.88.1-10+deb12u5`	fixed
Cpe	libcurl	Not reported	Not reported	unknown
Cpe	fedora	Not reported	Not reported	unknown
Cpe	hci_management_node	Not reported	Not reported	unknown
Cpe	solidfire	Not reported	Not reported	unknown
Cpe	hci_storage_node	Not reported	Not reported	unknown
Cpe	fabric_operating_system	Not reported	Not reported	unknown
Cpe	debian_linux	Not reported	Not reported	unknown
Cpe	sinec_infrastructure_network_services	Not reported	`1.0.1.1`	fixed
Cpe	communications_billing_and_revenue_management	Not reported	Not reported	unknown
Cpe	essbase	Not reported	Not reported	unknown
Cpe	universal_forwarder	Not reported	Not reported	unknown
Alpine	curl	3.12	`7.76.0-r0`	fixed
Alpine	curl	3.13	`7.76.0-r0`	fixed
Alpine	curl	3.14	`7.76.0-r0`	fixed
Alpine	curl	3.15	`7.76.0-r0`	fixed
Alpine	curl	3.16	`7.76.0-r0`	fixed
Alpine	curl	3.17	`7.76.0-r0`	fixed
Alpine	curl	3.18	`7.76.0-r0`	fixed
Alpine	curl	3.19	`7.76.0-r0`	fixed
Alpine	curl	3.20	`7.76.0-r0`	fixed
Alpine	curl	3.21	`7.76.0-r0`	fixed
Alpine	curl	3.22	`7.76.0-r0`	fixed
Alpine	curl	3.23	`7.76.0-r0`	fixed
Alpine	curl	3.24	`7.76.0-r0`	fixed
Ubuntu	curl	20.04	`7.65.3-1ubuntu3`	vulnerable
Ubuntu	curl	20.04	`7.65.3-1ubuntu4`	vulnerable
Ubuntu	curl	20.04	`7.66.0-1ubuntu1`	vulnerable
Ubuntu	curl	20.04	`7.67.0-2ubuntu1`	vulnerable
Ubuntu	curl	20.04	`7.68.0-1ubuntu1`	vulnerable
Ubuntu	curl	20.04	`7.68.0-1ubuntu2`	vulnerable
Ubuntu	curl	20.04	`7.68.0-1ubuntu2.1`	vulnerable
Ubuntu	curl	20.04	`7.68.0-1ubuntu2.2`	vulnerable
Ubuntu	curl	20.04	`7.68.0-1ubuntu2.4`	vulnerable
Ubuntu	curl	20.04	`7.68.0-1ubuntu2.5`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	curl	source	sid	`7.74.0-1.2`	not yet assigned	Not reported	[986270]
Debian	curl	source	forky	`7.74.0-1.2`	not yet assigned	Not reported	[986270]
Debian	curl	source	trixie	`7.74.0-1.2`	not yet assigned	Not reported	[986270]
Debian	curl	source	bookworm	`7.74.0-1.2`	not yet assigned	Not reported	[986270]
Cpe	sinec_infrastructure_network_services	cpe	Not reported	`1.0.1.1`	Not reported	NVD-CVE-2021-22890	Not reported
Alpine	curl	apk	3.12	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.13	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.14	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.15	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.16	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.17	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.18	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.19	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.20	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.21	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.22	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.23	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Alpine	curl	apk	3.24	`7.76.0-r0`	Not reported	ALPINE-CVE-2021-22890	Not reported
Ubuntu	curl	deb	20.04	`7.68.0-1ubuntu2.5`	Not reported	UBUNTU-CVE-2021-22890	Not reported

[Debian bug #986270]

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 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
[libcurl3-gnutls]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
[libcurl3-nss]Unknown
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
[libcurl4]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
[libcurl4-doc]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · all · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · all · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · all · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · all · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · all · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
[libcurl4-gnutls-dev]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
[libcurl4-nss-dev]Unknown
Source package: [curl]
Details (4)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
[libcurl4-openssl-dev]Unknown
Source package: [curl]
Details (6)
- 7.88.1-10+deb12u15 · amd64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u15 · arm64 · bookworm
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · amd64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 8.14.1-2+deb13u2~bpo13+1 · arm64 · bookworm-backports
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm
- 7.88.1-10+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 7.74.0-1.2
  dsa · curl · debian · bookworm

Observed: Oct 23, 2026, 5:54:51 PM UTC

References

[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]