CVE-1999-0843
CVE-1999-0843 is a medium-severity vulnerability in Cisco Router 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: 1% (68th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Cisco Router
- Published:
- Last modified:
Description
Denial of service in Cisco routers running NAT via a PORT command from an FTP client to a Telnet port.
Frequently asked questions
- What is CVE-1999-0843?
- Denial of service in Cisco routers running NAT via a PORT command from an FTP client to a Telnet port.
- How severe is CVE-1999-0843?
- CVE-1999-0843 has a CVSS 2.0 base score of 5.0, rated medium severity.
- Is CVE-1999-0843 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-1999-0843?
- CVE-1999-0843 affects Cisco Router. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-1999-0843?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-1999-0843 published?
- CVE-1999-0843 was published on 1999-11-04 and last updated on 2026-06-16.
References
Affected products (1)
- cpe:2.3:h:cisco:router:*:*:*:*:*:*:*:*
More vulnerabilities in Cisco Router
- CVE-1999-1216 — High (CVSS 7.5): Cisco routers 9.17 and earlier allow remote attackers to bypass security restrictions via certain IP source routed…
- CVE-1999-0222 — Medium (CVSS 5.0): Denial of service in Cisco IOS web server allows attackers to reboot the router using a long URL.
- CVE-1999-0453 — Medium (CVSS 5.0): An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol…