How severe is CVE-2019-1752?

CVE-2019-1752 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-1752 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-1752?

CVE-2019-1752 primarily affects Cisco Ios. In total, 322 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-1752?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-1752 published?

CVE-2019-1752 was published on 2019-03-28 and last updated on 2026-06-17.

CVE-2019-1752

CVE-2019-1752 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Ios
Published: 2019-03-28
Last modified: 2026-06-17

Description

A vulnerability in the ISDN functions of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload. The vulnerability is due to incorrect processing of specific values in the Q.931 information elements. An attacker could exploit this vulnerability by calling the affected device with specific Q.931 information elements being present. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device.

Frequently asked questions

What is CVE-2019-1752?: A vulnerability in the ISDN functions of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload. The vulnerability is due to incorrect processing of specific values in the Q.931 information elements. An attacker could exploit this vulnerability by calling the affected device with specific Q.931 information elements being present. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device.
How severe is CVE-2019-1752?: CVE-2019-1752 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-1752 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-1752?: CVE-2019-1752 primarily affects Cisco Ios. In total, 322 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-1752?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-1752 published?: CVE-2019-1752 was published on 2019-03-28 and last updated on 2026-06-17.

References

Affected products (322)

cpe:2.3:o:cisco:ios:15.0\(1\)m:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m6a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)m10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)xa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)xa1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)xa2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)xa3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)xa4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)xa5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)t1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)t2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)t3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)t4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)t5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)xb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)xb1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)xb2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)xb3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)gc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)gc1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)gc2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t0a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t2a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)t5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)t:*:*:*:*:*:*:*

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