How severe is CVE-1999-0740?

CVE-1999-0740 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-1999-0740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0740?

CVE-1999-0740 primarily affects Redhat Linux. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0740?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-0740 published?

CVE-1999-0740 was published on 1999-08-19 and last updated on 2026-06-16.

CVE-1999-0740

CVE-1999-0740 is a medium-severity vulnerability in Redhat Linux with a CVSS 2.0 base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Redhat Linux
Published: 1999-08-19
Last modified: 2026-06-16

Description

Remote attackers can cause a denial of service on Linux in.telnetd telnet daemon through a malformed TERM environmental variable.

Frequently asked questions

What is CVE-1999-0740?: Remote attackers can cause a denial of service on Linux in.telnetd telnet daemon through a malformed TERM environmental variable.
How severe is CVE-1999-0740?: CVE-1999-0740 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-1999-0740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0740?: CVE-1999-0740 primarily affects Redhat Linux. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0740?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0740 published?: CVE-1999-0740 was published on 1999-08-19 and last updated on 2026-06-16.

References

http://www.securityfocus.com/bid/594

Affected products (3)

cpe:2.3:o:redhat:linux:4.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:linux:5.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:linux:6.0:*:*:*:*:*:*:*

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