CVE-2021-21409
medium
CVSS v3
—
CVSS v4 NEW
—
VIR risk
5.5
Description
Possible request smuggling in HTTP/2 due missing validation of content-length
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1:4.1.48-4 |
| sid | Fixed | 1:4.1.48-4 |
| forky | Fixed | 1:4.1.48-4 |
| bullseye | Fixed | 1:4.1.48-4 |
| bookworm | Fixed | 1:4.1.48-4 |
Rocky Linux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | io.netty:netty-codec-http2 | >=4.0.0,<4.1.61.Final | 4.1.61.Final |
| Maven | org.jboss.netty:netty | | |
| Maven | io.netty:netty | | |
References
- https://www.suse.com/security/cve/CVE-2021-21409.html
- https://errata.rockylinux.org/RLSA-2022:5498
- https://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32
- https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj
- https://nvd.nist.gov/vuln/detail/CVE-2021-21409
- https://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432
- https://lists.apache.org/thread.html/re39391adcb863f0e9f3f15e7986255948f263f02e4700b82453e7102@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/re1911e05c08f3ec2bab85744d788773519a0afb27272a31ac2a0b4e8@%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rdd5715f3ee5e3216d5e0083a07994f67da6dbb9731ce9e7a6389b18e@%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rdd206d9dd7eb894cc089b37fe6edde2932de88d63a6d8368b44f5101@%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rd8f72411fb75b98d366400ae789966373b5c3eb3f511e717caf3e49e@%3Cissues.flink.apache.org%3E
- https://lists.apache.org/thread.html/rd4a6b7dec38ea6cd28b6f94bd4b312629a52b80be3786d5fb0e474bc@%3Cissues.kudu.apache.org%3E
- https://lists.apache.org/thread.html/rcae42fba06979934208bbd515584b241d3ad01d1bb8b063512644362@%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rca0978b634a0c3ebee4126ec29c7f570b165fae3f8f3658754c1cbd3@%3Cissues.kudu.apache.org%3E
- https://lists.apache.org/thread.html/rbde2f13daf4911504f0eaea43eee4f42555241b5f6d9d71564b6c5fa@%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rba2a9ef1d0af882ab58fadb336a58818495245dda43d32a7d7837187@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rafc77f9f03031297394f3d372ccea751b23576f8a2ae9b6b053894c5@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rac8cf45a1bab9ead5c9a860cbadd6faaeb7792203617b6ec3874736d@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/raa413040db6d2197593cc03edecfd168732e697119e6447b0a25d525@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/ra66e93703e3f4bd31bdfd0b6fb0c32ae96b528259bb1aa2b6d38e401@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/re4b0141939370304d676fe23774d0c6fbc584b648919825402d0cb39@%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/re7c69756a102bebce8b8681882844a53e2f23975a189363e68ad0324@%3Cissues.flink.apache.org%3E
- https://lists.apache.org/thread.html/re9e6ed60941da831675de2f8f733c026757fb4fa28a7b6c9f3dfb575@%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/redef0fb5474fd686781007de9ddb852b24f1b04131a248d9a4789183@%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf148b2bf6c2754153a8629bc7495e216bd0bd4c915695486542a10b4@%3Cnotifications.zookeeper.apache.org%3E
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.