How severe is CVE-1999-1336?

CVE-1999-1336 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-1336 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1336?

CVE-1999-1336 affects 3com Hiperarc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1336?

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

When was CVE-1999-1336 published?

CVE-1999-1336 was published on 1999-08-12 and last updated on 2026-06-16.

CVE-1999-1336

CVE-1999-1336 is a medium-severity vulnerability in 3com Hiperarc with a CVSS 2.0 base score of 5.0. 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 5.0)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: 3com Hiperarc
Published: 1999-08-12
Last modified: 2026-06-16

Description

3Com HiPer Access Router Card (HiperARC) 4.0 through 4.2.29 allows remote attackers to cause a denial of service (reboot) via a flood of IAC packets to the telnet port.

Frequently asked questions

What is CVE-1999-1336?: 3Com HiPer Access Router Card (HiperARC) 4.0 through 4.2.29 allows remote attackers to cause a denial of service (reboot) via a flood of IAC packets to the telnet port.
How severe is CVE-1999-1336?: CVE-1999-1336 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-1336 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1336?: CVE-1999-1336 affects 3com Hiperarc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1336?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1336 published?: CVE-1999-1336 was published on 1999-08-12 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:h:3com:hiperarc:*:*:*:*:*:*:*:*