DEBIAN-CVE-2021-22890
Record from OSV · Published April 1, 2021
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| curl | Debian:12 | 7.74.0-1.2 |
| curl | Debian:14 | 7.74.0-1.2 |
| curl | Debian:13 | 7.74.0-1.2 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | curl | 0 |
| Debian:14 | curl | 0 |
| Debian:13 | curl | 0 |
Timeline
- Apr 1, 2021 CVE Published
- Oct 15, 2026 CVE Updated
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln DEBIAN-CVE-2021-22890
vulnetix vdb fixes DEBIAN-CVE-2021-22890Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
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