CVE-2020-1935
Description
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
Predictions
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
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 9.0.31-1 |
| sid | Fixed | 9.0.31-1 |
| forky | Fixed | 9.0.31-1 |
| bullseye | Fixed | 9.0.31-1 |
| bookworm | Fixed | 9.0.31-1 |
Red Hat Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
Rocky Linux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.apache.tomcat.embed:tomcat-embed-core | <7.0.100 | 7.0.100 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >=8.0.0,<8.5.51 | 8.5.51 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >=9.0.0,<9.0.31 | 9.0.31 |
| Maven | org.apache.tomcat:tomcat | <7.0.100 | 7.0.100 |
| Maven | org.apache.tomcat:tomcat | >=8.0.0,<8.5.51 | 8.5.51 |
| Maven | org.apache.tomcat:tomcat | >=9.0.0,<9.0.31 | 9.0.31 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-1935
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.debian.org/security/2020/dsa-4680
- https://www.debian.org/security/2020/dsa-4673
- https://usn.ubuntu.com/4448-1
- https://security.netapp.com/advisory/ntap-20200327-0005
- https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html
- https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html
- https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743@%3Ccommits.tomee.apache.org%3E
- https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7@%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1@%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78@%3Ccommits.tomee.apache.org%3E
- https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919@%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75@%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html
- https://errata.rockylinux.org/RLSA-2020:4847
- https://security-tracker.debian.org/tracker/CVE-2020-1935
- https://access.redhat.com/errata/RHSA-2020:4847
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.