CVE-2018-21245: Pound before 2.8 allows HTTP request smuggling, a related issue to CVE-2016-10711.

Q: How do I fix CVE-2018-21245?

pound: upgrade to 2.8. Exact commands for each OS are on this page.

Q: Is CVE-2018-21245 being exploited?

CVE-2018-21245 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-2018-21245 affect?

CVE-2018-21245 affects pound. Severity is critical (CVSS 9.1). Pound before 2.8 allows HTTP request smuggling, a related issue to CVE-2016-10711.

Q: How urgent is CVE-2018-21245?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2018-21245 is a critical-severity flaw (CVSS 9.1) affecting pound. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Pound before 2.8 allows HTTP request smuggling, a related issue to CVE-2016-10711.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-444
Published	2020-06-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: apsis

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

Am I affected?

Timeline

2020-06-15 17:15 UTCPublished CVE record published
2026-06-17 01:54 UTCUpdated Record last modified

apsis pound UPGRADE

Affected: < 2.8

Fixed in: 2.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pound || rpm -q pound || pound --version

2. UPGRADE to 2.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pound

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pound

Note

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

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-2018-21245?

pound: upgrade to 2.8. Exact commands for each OS are on this page.

Is CVE-2018-21245 being exploited?

CVE-2018-21245 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-2018-21245 affect?

CVE-2018-21245 affects pound. Severity is critical (CVSS 9.1). Pound before 2.8 allows HTTP request smuggling, a related issue to CVE-2016-10711.

How urgent is CVE-2018-21245?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

References

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