How severe is CVE-2019-1758?

CVE-2019-1758 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2019-1758 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-1758?

CVE-2019-1758 primarily affects Cisco Ios. In total, 72 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-1758?

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

When was CVE-2019-1758 published?

CVE-2019-1758 was published on 2019-03-28 and last updated on 2026-06-17.

CVE-2019-1758

CVE-2019-1758 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 4.7. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
CVSS v2: 3.3
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Cisco Ios
Published: 2019-03-28
Last modified: 2026-06-17

Description

A vulnerability in 802.1x function of Cisco IOS Software on the Catalyst 6500 Series Switches could allow an unauthenticated, adjacent attacker to access the network prior to authentication. The vulnerability is due to how the 802.1x packets are handled in the process path. An attacker could exploit this vulnerability by attempting to connect to the network on an 802.1x configured port. A successful exploit could allow the attacker to intermittently obtain access to the network.

Frequently asked questions

What is CVE-2019-1758?: A vulnerability in 802.1x function of Cisco IOS Software on the Catalyst 6500 Series Switches could allow an unauthenticated, adjacent attacker to access the network prior to authentication. The vulnerability is due to how the 802.1x packets are handled in the process path. An attacker could exploit this vulnerability by attempting to connect to the network on an 802.1x configured port. A successful exploit could allow the attacker to intermittently obtain access to the network.
How severe is CVE-2019-1758?: CVE-2019-1758 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2019-1758 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-1758?: CVE-2019-1758 primarily affects Cisco Ios. In total, 72 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-1758?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-1758 published?: CVE-2019-1758 was published on 2019-03-28 and last updated on 2026-06-17.

References

Affected products (72)

cpe:2.3:o:cisco:ios:12.2\(33\)sxj6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sxj7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sxj8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sxj9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sxj10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(60\)ez12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sg8a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy4a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy11:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy13:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svg3d:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svi1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svk4b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svk4c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svm3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svn2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svo1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svo2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svp1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svp2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(4\)m12c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(1\)sy:*:*:*:*:*:*:*

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