CVE-2018-25016: Greenbone Security Assistant (GSA) before 7.0.3 and Greenbone OS (GOS) before 5.0.0 allow Host Header Injectio

Q: How do I fix CVE-2018-25016?

greenbone security assistant: upgrade to 7.0.3; greenbone os: upgrade to 5.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2018-25016 being exploited?

CVE-2018-25016 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-25016 affect?

CVE-2018-25016 affects greenbone security assistant, greenbone os. Severity is critical (CVSS 9.8). Greenbone Security Assistant (GSA) before 7.0.3 and Greenbone OS (GOS) before 5.0.0 allow Host Header Injection.

Q: How urgent is CVE-2018-25016?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2018-25016 is a critical-severity flaw (CVSS 9.8) affecting greenbone security assistant, greenbone os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Greenbone Security Assistant (GSA) before 7.0.3 and Greenbone OS (GOS) before 5.0.0 allow Host Header Injection.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-74
Published	2021-06-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: greenbone

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-21 15:15 UTCPublished CVE record published
2026-06-17 01:54 UTCUpdated Record last modified

greenbone greenbone security assistant UPGRADE

Affected: < 7.0.3

Fixed in: 7.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy greenbone-security-assistant || rpm -q greenbone-security-assistant || greenbone-security-assistant --version

2. UPGRADE to 7.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade greenbone-security-assistant

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade greenbone-security-assistant

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

greenbone greenbone os UPGRADE

Affected: < 5.0.0

Fixed in: 5.0.0

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-25016?

greenbone security assistant: upgrade to 7.0.3; greenbone os: upgrade to 5.0.0. Exact commands for each OS are on this page.

Is CVE-2018-25016 being exploited?

CVE-2018-25016 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-25016 affect?

CVE-2018-25016 affects greenbone security assistant, greenbone os. Severity is critical (CVSS 9.8). Greenbone Security Assistant (GSA) before 7.0.3 and Greenbone OS (GOS) before 5.0.0 allow Host Header Injection.

How urgent is CVE-2018-25016?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-25047 MEDIUM 6.1 UPGRADE UPGRADE Greenbone Security Assistant (GSA) before 8.0.2 and Greenbone OS (GOS) before 5.0.10 allow XSS during 404 URL

References

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