CVE-2010-2075: UnrealIRCd 3.2.8.1, as distributed on certain mirror sites from November 2009 through June 2010, contains an e

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HIGH 7.5DOWNGRADE

CVE-2010-2075 is a high-severity flaw (CVSS 7.5) affecting unrealircd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

UnrealIRCd 3.2.8.1, as distributed on certain mirror sites from November 2009 through June 2010, contains an externally introduced modification (Trojan Horse) in the DEBUG3_DOLOG_SYSTEM macro, which allows remote attackers to execute arbitrary commands.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	83.5% (top 1%)
CISA exploited list	No
Weakness	CWE-20
Published	2010-06-15
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: unrealircd

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

Am I affected?

Timeline

2010-06-15 14:04 UTCPublished CVE record published
2026-06-16 23:19 UTCUpdated Record last modified

unrealircd unrealircd DOWNGRADE

Affected: 3.2.8.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.8.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.2.8.1 (Debian / Ubuntu)

apt-cache madison unrealircd sudo apt install unrealircd=<VERSION_BEFORE_3.2.8.1> sudo apt-mark hold unrealircd

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

dnf --showduplicates list unrealircd sudo dnf downgrade unrealircd-<VERSION_BEFORE_3.2.8.1> sudo dnf versionlock add unrealircd

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: UnrealIRCd 3.2.8.1 - Backdoor Command Execution (Metasploit)
Exploit-DB: UnrealIRCd 3.2.8.1 - Remote Downloader/Execute
Metasploit: UnrealIRCD 3.2.8.1 Backdoor Command Execution

Advisories and coverage

Research and news

Vulners Bulletins: nessus-metasploit-lab 2026-11-02

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-2010-2075?

unrealircd: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2010-2075 being exploited?

CVE-2010-2075 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-2010-2075 affect?

CVE-2010-2075 affects unrealircd. Severity is high (CVSS 7.5). UnrealIRCd 3.2.8.1, as distributed on certain mirror sites from November 2009 through June 2010, contains an externally introduced modification (Trojan Horse) in the DEBUG3_DOLOG_SYSTEM macro, which allows remote attackers to execute arbitr

How urgent is CVE-2010-2075?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

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References

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