How severe is CVE-1999-0159?

CVE-1999-0159 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-1999-0159 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0159?

CVE-1999-0159 primarily affects Cisco Ios. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0159?

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

When was CVE-1999-0159 published?

CVE-1999-0159 was published on 1998-08-12 and last updated on 2026-06-16.

CVE-1999-0159

CVE-1999-0159 is a low-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Cisco Ios
Published: 1998-08-12
Last modified: 2026-06-16

Description

Attackers can crash a Cisco IOS router or device, provided they can get to an interactive prompt (such as a login). This applies to some IOS 9.x, 10.x, and 11.x releases.

Frequently asked questions

What is CVE-1999-0159?: Attackers can crash a Cisco IOS router or device, provided they can get to an interactive prompt (such as a login). This applies to some IOS 9.x, 10.x, and 11.x releases.
How severe is CVE-1999-0159?: CVE-1999-0159 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-1999-0159 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0159?: CVE-1999-0159 primarily affects Cisco Ios. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0159?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0159 published?: CVE-1999-0159 was published on 1998-08-12 and last updated on 2026-06-16.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0159

Affected products (16)

cpe:2.3:o:cisco:ios:9.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(20.3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(15\)ca:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(16\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(16\)aa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(16\)ia:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(17\)cc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(17\)ct:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2\(8\)sa3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2\(9\)p:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2\(9\)xa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2\(10\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2\(10\)bc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.3\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.3\(1\)ed:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.3\(1\)t:*:*:*:*:*:*:*

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