CVE-2019-16869
Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (8.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 8.64% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- netty/netty · debian/debian linux · canonical/ubuntu linux · redhat/jboss enterprise application platform
- Source
- cve@mitre.org
EPSS 8.6% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://access.redhat.com/errata/RHSA-2019:3892Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3901Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0159Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0160Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0161Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0164Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0445Third Party Advisory
- https://github.com/netty/netty/compare/netty-4.1.41.Final...netty-4.1.42.FinalPatch, Third Party Advisory
- https://github.com/netty/netty/issues/9571Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/poc-effectiveness/PoCAdaptation/tree/main/Adapted/CVE-2019-16869/5.0.0.Alpha1/exploit
- https://lists.apache.org/thread.html/0acadfb96176768caac79b404110df62d14d30aa9d53b6dbdb1407ac@%3Cissues.spark.apache.org%3E
- https://lists.apache.org/thread.html/19fed892608db1efe5a5ce14372137669ff639df0205323959af7de3@%3Cdev.olingo.apache.org%3E
- https://lists.apache.org/thread.html/2494a2ac7f66af6e4646a4937b17972a4ec7cd3c7333c66ffd6c639d@%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/2e1cf538b502713c2c42ffa46d81f4688edb5676eb55bd9fc4b4fed7@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/35961d1ae00849974353a932b4fef12ebce074541552eceefa04f1fd@%3Cdev.olingo.apache.org%3E
- https://lists.apache.org/thread.html/37ed432b8eb35d8bd757f53783ec3e334bd51f514534432bea7f1c3d@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/380f6d2730603a2cd6b0a8bea9bcb21a86c199147e77e448c5f7390b@%3Ccommits.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/3e6d7aae1cca10257e3caf2d69b22f74c875f12a1314155af422569d@%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/51923a9ba513b2e816e02a9d1fd8aa6f12e3e4e99bbd9dc884bccbbe@%3Cissues.spark.apache.org%3E
- https://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e2f07864b5108f@%3Cdev.drill.apache.org%3E
- https://lists.apache.org/thread.html/6063699b87b501ecca8dd3b0e82251bfc85f29363a9b46ac5ace80cf@%3Cdev.olingo.apache.org%3E
- https://lists.apache.org/thread.html/64b10f49c68333aaecf00348c5670fe182e49fd60d45c4a3ab241f8b@%3Cissues.spark.apache.org%3E
- https://lists.apache.org/thread.html/681493a2f9b63f5b468f741d88d1aa51b2cfcf7a1c5b74ea8c4343fb@%3Cissues.spark.apache.org%3E
- https://lists.apache.org/thread.html/6e1e34c0d5635a987d595df9e532edac212307243bb1b49eead6d55b@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/76540c8b0ed761bfa6c81fa28c13057f13a5448aed079d656f6a3c79@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/799eb85d67cbddc1851a3e63a07b55e95b2f44f1685225d38570ce89@%3Cissues.spark.apache.org%3E
- https://lists.apache.org/thread.html/860acce024d79837e963a51a42bab2cef8e8d017aad2b455ecd1dcf0@%3Cissues.spark.apache.org%3E
- https://lists.apache.org/thread.html/9128111213b7b734ffc85db08d8f789b00a85a7f241b708e55debbd0@%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe@%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/a0f77c73af32cbe4ff0968bfcbbe80ae6361f3dccdd46f3177547266@%3Cissues.zookeeper.apache.org%3E
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.