CVE-2013-7177: config/filter.d/cyrus-imap.conf in the cyrus-imap filter in Fail2ban before 0.8.11 allows remote attackers to

Q: How do I fix CVE-2013-7177?

fail2ban: upgrade to newer than 0.8.10. Exact commands for each OS are on this page.

Q: Is CVE-2013-7177 being exploited?

CVE-2013-7177 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-2013-7177 affect?

CVE-2013-7177 affects fail2ban. Severity is medium (CVSS 5.0). config/filter.d/cyrus-imap.conf in the cyrus-imap filter in Fail2ban before 0.8.11 allows remote attackers to trigger the blocking of an arbitrary IP address via a crafted e-mail address that matches an improperly designed regular expressio

Q: How urgent is CVE-2013-7177?

Priority 45/100. Public exploit reference

This month

MEDIUM 5.0UPGRADE

CVE-2013-7177 is a medium-severity flaw (CVSS 5.0) affecting fail2ban. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

config/filter.d/cyrus-imap.conf in the cyrus-imap filter in Fail2ban before 0.8.11 allows remote attackers to trigger the blocking of an arbitrary IP address via a crafted e-mail address that matches an improperly designed regular expression.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Weakness	CWE-20
Published	2014-02-01
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: fail2ban

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

Am I affected?

Timeline

2014-02-01 15:55 UTCPublished CVE record published
2026-06-17 00:01 UTCUpdated Record last modified

fail2ban fail2ban UPGRADE

Affected: <= 0.8.10 · 0.1.0 · 0.1.1 · 0.1.2 · 0.3.0 · 0.3.1 · 0.4.0 · 0.4.1

Fixed in: newer than 0.8.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fail2ban || rpm -q fail2ban || fail2ban --version

2. UPGRADE to newer than 0.8.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fail2ban

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fail2ban

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-2013-7177?

fail2ban: upgrade to newer than 0.8.10. Exact commands for each OS are on this page.

Is CVE-2013-7177 being exploited?

CVE-2013-7177 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-2013-7177 affect?

CVE-2013-7177 affects fail2ban. Severity is medium (CVSS 5.0). config/filter.d/cyrus-imap.conf in the cyrus-imap filter in Fail2ban before 0.8.11 allows remote attackers to trigger the blocking of an arbitrary IP address via a crafted e-mail address that matches an improperly designed regular expressio

How urgent is CVE-2013-7177?

Priority 45/100. Public exploit reference

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References

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