CVE-1999-0160 — Some classic Cisco IOS devices have a vulnerability in the PPP CHAP authentication to establish unauthorized PPP connections

Some classic Cisco IOS devices have a vulnerability in the PPP CHAP authentication to establish unauthorized PPP connections

Published Sep 29, 1999

No CVSS score

EPSS 1.22%

Some classic Cisco IOS devices have a vulnerability in the PPP CHAP authentication to establish unauthorized PPP connections.

No remediation recorded yet.

1.22% 0.01223

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01223

2022–2026

Table of values (10 key points)

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

Date	Score	Percentile	Model
Oct 3, 2026	1.22% (0.01223)	67.70th	v5 (v2026.06.15)
Jun 15, 2026	1.23% (0.01233)	64.98th	v5 (v2026.06.15)
Mar 17, 2025	0.49% (0.00493)	63.62th	v4 (v2025.03.14)
Dec 12, 2024	1.50% (0.01500)	87.45th	v3 (v2023.03.01)
Feb 8, 2024	1.50% (0.01500)	86.51th	v3 (v2023.03.01)
Mar 7, 2023	0.76% (0.00764)	78.35th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Sep 10, 2022	1.02% (0.01018)	38.88th	v2 (v2022.01.01)
Apr 1, 2022	1.02% (0.01018)	36.86th	v2 (v2022.01.01)
Feb 4, 2022	1.02% (0.01018)	19.50th	v2 (v2022.01.01)

Weaknesses (0)

No CWE recorded.

Link	Providers	Tags
http://www.osvdb.org/1099		vdb-entryx_refsource_OSVDB

No recorded changes yet.

Sources

Status PUBLISHED

Assigner mitre

Published Sep 29, 1999

Updated Aug 1, 2024

Reserved Jun 7, 1999

Updated n/a

Status Modified

Modified Jun 16, 2026

Severity n/a

Public date n/a