How severe is CVE-2019-1761?

CVE-2019-1761 has a CVSS 3.x base score of 4.3, 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 low, integrity none, and availability none.

Is CVE-2019-1761 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-1761?

CVE-2019-1761 primarily affects Cisco Ios. In total, 1761 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-1761?

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

When was CVE-2019-1761 published?

CVE-2019-1761 was published on 2019-03-28 and last updated on 2026-06-17.

CVE-2019-1761

CVE-2019-1761 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 4.3. 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-665.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 3.3
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-665
Affected product: Cisco Ios
Published: 2019-03-28
Last modified: 2026-06-17

Description

A vulnerability in the Hot Standby Router Protocol (HSRP) subsystem of Cisco IOS and IOS XE Software could allow an unauthenticated, adjacent attacker to receive potentially sensitive information from an affected device. The vulnerability is due to insufficient memory initialization. An attacker could exploit this vulnerability by receiving HSRPv2 traffic from an adjacent HSRP member. A successful exploit could allow the attacker to receive potentially sensitive information from the adjacent device.

Frequently asked questions

What is CVE-2019-1761?: A vulnerability in the Hot Standby Router Protocol (HSRP) subsystem of Cisco IOS and IOS XE Software could allow an unauthenticated, adjacent attacker to receive potentially sensitive information from an affected device. The vulnerability is due to insufficient memory initialization. An attacker could exploit this vulnerability by receiving HSRPv2 traffic from an adjacent HSRP member. A successful exploit could allow the attacker to receive potentially sensitive information from the adjacent device.
How severe is CVE-2019-1761?: CVE-2019-1761 has a CVSS 3.x base score of 4.3, 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 low, integrity none, and availability none.
Is CVE-2019-1761 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-1761?: CVE-2019-1761 primarily affects Cisco Ios. In total, 1761 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-1761?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-1761 published?: CVE-2019-1761 was published on 2019-03-28 and last updated on 2026-06-17.

References

Affected products (1761)

cpe:2.3:o:cisco:ios:12.2\(6\)i1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)cx:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)cy:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)cy1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)cy2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ira:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ird:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ire:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ire1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)ire2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irf:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irg1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irh:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)irh1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mra:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)mrb6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb6a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb6b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb8a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sb8b:*:*:*:*:*:*:*

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