CVE-2001-1505: tinc 1.0pre3 and 1.0pre4 allows remote attackers to inject data into user sessions by sniffing and replaying p

Routine

MEDIUM 5.0DOWNGRADE

CVE-2001-1505 is a medium-severity flaw (CVSS 5.0) affecting tinc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

tinc 1.0pre3 and 1.0pre4 allows remote attackers to inject data into user sessions by sniffing and replaying packets.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2001-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: tinc

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

Am I affected?

Timeline

2001-12-31 05:00 UTCPublished CVE record published
2026-06-16 21:56 UTCUpdated Record last modified

tinc tinc DOWNGRADE

Affected: 1.0pre3 · 1.0pre4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0pre3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0pre3 (Debian / Ubuntu)

apt-cache madison tinc sudo apt install tinc=<VERSION_BEFORE_1.0pre3> sudo apt-mark hold tinc

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

dnf --showduplicates list tinc sudo dnf downgrade tinc-<VERSION_BEFORE_1.0pre3> sudo dnf versionlock add tinc

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-2001-1505?

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

Is CVE-2001-1505 being exploited?

CVE-2001-1505 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-2001-1505 affect?

CVE-2001-1505 affects tinc. Severity is medium (CVSS 5.0). tinc 1.0pre3 and 1.0pre4 allows remote attackers to inject data into user sessions by sniffing and replaying packets.

How urgent is CVE-2001-1505?

Priority 35/100. No elevated risk signals yet.

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CVE-2018-16738 LOW 3.7 UPGRADE MITIGATE tinc 1.0.30 through 1.0.34 has a broken authentication protocol, although there is a partial mitigation
CVE-2018-16737 MEDIUM 5.3 UPGRADE DOWNGRADE tinc before 1.0.30 has a broken authentication protocol, without even a partial mitigation.
CVE-2013-1428 MEDIUM 6.5 UPGRADE Stack-based buffer overflow in the receive_tcppacket function in net_packet.c in tinc before 1.0.21 and 1.1 be
CVE-2002-1755 MEDIUM 5.0 DOWNGRADE tinc 1.0pre3 and 1.0pre4 VPN does not authenticate forwarded packets, which allows remote attackers to inject

References

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