CVE-1999-0775 - Cisco Gigabit Switch routers running IOS allow remote attackers to forward unauthorized packets due to improper handling of the "established" keyword in an access list

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HIGH

Cisco Gigabit Switch routers running IOS allow remote attackers to forward unauthorized packets due to improper handling of the "established" keyword in an access list

Published Jan 18, 2000

10.0

HIGH

CVSS 2.0

EPSS 3.19%

Description

Cisco Gigabit Switch routers running IOS allow remote attackers to forward unauthorized packets due to improper handling of the "established" keyword in an access list.

Affected products

Remediation

No remediation recorded yet.

Metrics

3.19% 0.03189

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.

EPSS probability 0.03189

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 (12 key points)

Flat stretches are collapsed. Showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 4, 2026	3.19% (0.03189)	87.66th	v5 (v2026.06.15)
Jun 15, 2026	3.13% (0.03129)	86.14th	v5 (v2026.06.15)
Mar 30, 2025	1.10% (0.01105)	76.12th	v4 (v2025.03.14)
Mar 29, 2025	3.08% (0.03078)	77.82th	v4 (v2025.03.14)
Mar 17, 2025	1.34% (0.01336)	78.65th	v4 (v2025.03.14)
Dec 12, 2024	0.56% (0.00562)	78.44th	v3 (v2023.03.01)
Feb 8, 2024	0.56% (0.00562)	77.00th	v3 (v2023.03.01)
Mar 7, 2023	0.95% (0.00946)	80.76th	v3 (v2023.03.01)
Mar 6, 2023	1.14% (0.01136)	59.45th	v2 (v2022.01.01)
Aug 18, 2022	1.14% (0.01136)	57.74th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)

Weaknesses (0)

No CWE recorded.

References (1)

https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0775
x_refsource_MISC

Link	Providers	Tags
https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0775		x_refsource_MISC

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Jan 18, 2000

Updated Aug 1, 2024

Reserved Nov 25, 1999

Link CVE-1999-0775

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-1999-0775

Red Hat

Severity n/a

Public date n/a

Links CVE-1999-0775