5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
0.166 Low
EPSS
Percentile
95.9%
The content-length header is not correctly validated if the request only use a single Http2HeaderFrame with the endStream set to to true. This could lead to request smuggling if the request is proxied to a remote peer and translated to HTTP/1.1
This is a followup of https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj which did miss to fix this one case.
This was fixed as part of 4.1.61.Final
Validation can be done by the user before proxy the request by validating the header.
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295
github.com/netty/netty
github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432
github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32
github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj
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nvd.nist.gov/vuln/detail/CVE-2021-21409
security.netapp.com/advisory/ntap-20210604-0003
www.debian.org/security/2021/dsa-4885
www.oracle.com//security-alerts/cpujul2021.html
www.oracle.com/security-alerts/cpuapr2022.html
www.oracle.com/security-alerts/cpujan2022.html
www.oracle.com/security-alerts/cpuoct2021.html
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
0.166 Low
EPSS
Percentile
95.9%