CVE-2019-10797Network attack vector

HTTP response splitting via disabled header validation

Published Feb 19, 2020 · Updated Aug 4, 2024

HTTP response splitting in WSO2 transport-http before 6.3.1 allows remote attackers to inject additional HTTP responses via crafted headers. Util.createHttpResponse and createFullHttpResponse constructed Netty responses with header validation disabled, allowing CRLF characters in outbound header values. A consuming C5 application must place attacker-controlled data into a response header, and successful exploitation requires user interaction to alter downstream HTTP content.

CVSS severity6.5
Medium
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP response splitting in WSO2 transport-http before 6.3.1 allows remote attackers to inject additional HTTP responses via crafted headers. Util.createHttpResponse and createFullHttpResponse constructed Netty responses with header validation disabled, allowing CRLF characters in outbound header values. A consuming C5 application must place attacker-controlled data into a response header, and successful exploitation requires user interaction to alter downstream HTTP content.

The record

CVE
CVE-2019-10797
Published
Feb 19, 2020
Updated
Aug 4, 2024
Vendor
WSO2
Product
WSO2 transport-http
Classifications
CWE-113, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions prior to version v6.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WSO2 · WSO2 transport-httpversion=All versions prior to version v6.3.1

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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