CVE-2016-7145: The m_authenticate function in ircd/m_authenticate.c in nefarious2 allows remote attackers to spoof certificat

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2016-7145 is a critical-severity flaw (CVSS 9.8) affecting nefarious2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The m_authenticate function in ircd/m_authenticate.c in nefarious2 allows remote attackers to spoof certificate fingerprints and consequently log in as another user via a crafted AUTHENTICATE parameter.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-287
Published	2017-03-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nefarious2 project

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

Am I affected?

Timeline

2017-03-07 15:59 UTCPublished CVE record published
2026-06-17 00:52 UTCUpdated Record last modified

nefarious2 project nefarious2 DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy nefarious2 || rpm -q nefarious2 || nefarious2 --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison nefarious2 sudo apt install nefarious2=<VERSION_BEFORE_2.0> sudo apt-mark hold nefarious2

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

dnf --showduplicates list nefarious2 sudo dnf downgrade nefarious2-<VERSION_BEFORE_2.0> sudo dnf versionlock add nefarious2

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-2016-7145?

nefarious2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-7145 being exploited?

CVE-2016-7145 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-2016-7145 affect?

CVE-2016-7145 affects nefarious2. Severity is critical (CVSS 9.8). The m_authenticate function in ircd/m_authenticate.c in nefarious2 allows remote attackers to spoof certificate fingerprints and consequently log in as another user via a crafted AUTHENTICATE parameter.

How urgent is CVE-2016-7145?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

References

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