IBM DataPower Gateway 10.0.2.0 through 1.0.3.0, 10.0.1.0 through 10.0.1.5, and 2018.4.1.0 through 2018.4.1.18 is vulnerable to HTTP header…

published 2022-05-18 4y ago modified 2026-06-17 4mo ago also EUVD-2021-25381

cvss: 4.8; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

IBM DataPower Gateway 10.0.2.0 through 1.0.3.0, 10.0.1.0 through 10.0.1.5, and 2018.4.1.0 through 2018.4.1.18 is vulnerable to HTTP header injection, caused by improper validation of input by the HOST headers. This could allow an attacker to conduct various attacks against the vulnerable system, including cross-site scripting, cache poisoning or session hijacking. IBM X-Force ID: 211236.

Patch / fix

links 1

ibm.com/support/pages/node/6587070 advisory

Is CVE-2021-38944 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	4.8	CVSS:3.0/AV:N/C:L/A:N/I:L/UI:N/PR:N/S:U/AC:H/E:U/RC:C/RL:O
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA	3.0	4.8	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

IBM DataPower Gateway

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

ibm.com /support/pages/node/6587070
patch, vendor-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/211236
vdb-entry, vendor-advisory

Sources

CVE List CVE-2021-38944
NVD CVE-2021-38944

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.