CVE-1999-0159 — Attackers can crash a Cisco IOS router or device, provided they can get to an interactive prompt (such as a login)

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LOW

Attackers can crash a Cisco IOS router or device, provided they can get to an interactive prompt (such as a login)

Published Sep 29, 1999

3.5

LOW

CVSS 3.1

EPSS 1.10%

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.10% 0.01101

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.01101

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (11 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	1.10% (0.01101)	64.49th	v5 (v2026.06.15)
Jun 15, 2026	1.08% (0.01080)	60.60th	v5 (v2026.06.15)
Mar 17, 2025	0.50% (0.00504)	64.06th	v4 (v2025.03.14)
Dec 12, 2024	2.07% (0.02071)	89.51th	v3 (v2023.03.01)
Feb 8, 2024	2.07% (0.02071)	88.68th	v3 (v2023.03.01)
Mar 7, 2023	0.30% (0.00304)	64.94th	v3 (v2023.03.01)
Mar 6, 2023	0.95% (0.00954)	36.37th	v2 (v2022.01.01)
Feb 23, 2023	0.95% (0.00954)	36.27th	v2 (v2022.01.01)
Aug 17, 2022	0.95% (0.00954)	34.25th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)