CVE-2005-2771: WRQ Reflection for Secure IT Windows Server 6.0 (formerly known as F-Secure SSH server) processes access and d

This month

HIGH 10.0DOWNGRADEDOWNGRADE

CVE-2005-2771 is a high-severity flaw (CVSS 10.0) affecting f-secure ssh server, wrq reflection for secure it windows server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WRQ Reflection for Secure IT Windows Server 6.0 (formerly known as F-Secure SSH server) processes access and deny lists in a case-sensitive manner, when previous versions were case-insensitive, which might allow remote attackers to bypass intended restrictions and login to accounts that should be denied.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.8% (top 8%)
CISA exploited list	No
Published	2005-09-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: f-secure · wrq

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2005-09-02 23:03 UTCPublished CVE record published
2026-06-16 22:15 UTCUpdated Record last modified

f-secure f-secure ssh server DOWNGRADE

Affected: 5.1 · 5.2 · 5.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1

1. Check installed version

apt-cache policy f-secure-ssh-server || rpm -q f-secure-ssh-server || f-secure-ssh-server --version

2. No fixed release: DOWNGRADE to a release before 5.1 (Debian / Ubuntu)

apt-cache madison f-secure-ssh-server sudo apt install f-secure-ssh-server=<VERSION_BEFORE_5.1> sudo apt-mark hold f-secure-ssh-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list f-secure-ssh-server sudo dnf downgrade f-secure-ssh-server-<VERSION_BEFORE_5.1> sudo dnf versionlock add f-secure-ssh-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

wrq wrq reflection for secure it windows server DOWNGRADE

Affected: 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy wrq-reflection-for-secure-it-windows-server || rpm -q wrq-reflection-for-secure-it-windows-server || wrq-reflection-for-secure-it-windows-server --version

2. No fixed release: DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison wrq-reflection-for-secure-it-windows-server sudo apt install wrq-reflection-for-secure-it-windows-server=<VERSION_BEFORE_6.0> sudo apt-mark hold wrq-reflection-for-secure-it-windows-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wrq-reflection-for-secure-it-windows-server sudo dnf downgrade wrq-reflection-for-secure-it-windows-server-<VERSION_BEFORE_6.0> sudo dnf versionlock add wrq-reflection-for-secure-it-windows-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2005-2771?

f-secure ssh server: downgrade or apply the listed mitigation; wrq reflection for secure it windows server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2005-2771 being exploited?

CVE-2005-2771 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-2005-2771 affect?

CVE-2005-2771 affects f-secure ssh server, wrq reflection for secure it windows server. Severity is high (CVSS 10.0). WRQ Reflection for Secure IT Windows Server 6.0 (formerly known as F-Secure SSH server) processes access and deny lists in a case-sensitive manner, when previous versions were case-insensitive, which might allow remote attackers to bypass i

How urgent is CVE-2005-2771?

Priority 58/100. Critical severity; EPSS top 8%: very likely to be exploited

Software pages

Windows vulnerabilities · Windows Server vulnerabilities

Related CVEs

CVE-2006-0705 MEDIUM 6.5 DOWNGRADE DOWNGRADE Format string vulnerability in a logging function as used by various SFTP servers, including (1) AttachmateWRQ

References

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