CVE-2001-1263: telnet95.exe in Pragma InterAccess 4.0 build 5 allows remote attackers to cause a denial of service (crash) vi

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MEDIUM 5.0DOWNGRADE

CVE-2001-1263 is a medium-severity flaw (CVSS 5.0) affecting interaccess. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

telnet95.exe in Pragma InterAccess 4.0 build 5 allows remote attackers to cause a denial of service (crash) via a large number of characters to port 23, possibly due to a buffer overflow.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	7.6% (top 5%)
CISA exploited list	No
Published	2001-06-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: pragma systems

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

Am I affected?

Timeline

2001-06-06 04:00 UTCPublished CVE record published
2026-06-16 21:55 UTCUpdated Record last modified

pragma systems interaccess DOWNGRADE

Affected: 4.0_build_5

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0_build_5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.0_build_5 (Debian / Ubuntu)

apt-cache madison interaccess sudo apt install interaccess=<VERSION_BEFORE_4.0_build_5> sudo apt-mark hold interaccess

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

dnf --showduplicates list interaccess sudo dnf downgrade interaccess-<VERSION_BEFORE_4.0_build_5> sudo dnf versionlock add interaccess

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: Pragma Systems InterAccess TelnetD Server 4.0 - Denial of Service

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-2001-1263?

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

Is CVE-2001-1263 being exploited?

CVE-2001-1263 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-2001-1263 affect?

CVE-2001-1263 affects interaccess. Severity is medium (CVSS 5.0). telnet95.exe in Pragma InterAccess 4.0 build 5 allows remote attackers to cause a denial of service (crash) via a large number of characters to port 23, possibly due to a buffer overflow.

How urgent is CVE-2001-1263?

Priority 46/100. EPSS top 5%: very likely to be exploited; Public exploit reference

References

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