8.6

CVE-2021-1387: cisco cisco nx-os software

CVSS: 8.6v3.1HighModified
Published 24-02-2021Last modified 08-11-2024
Open JSON

Vulnerability summary

CVE-2021-1387 is a high (CVSS 8.6) vulnerability in cisco cisco nx-os software. EPSS estimates a 1.42% chance of exploitation in the next 30 days, higher than 72.3% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v3.1 (CVE.org)
EPSS score
1.42%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-02-2021
    PublishedVulnerability first disclosed.
  2. 08-11-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because the software improperly releases resources when it processes certain IPv6 packets that are destined to an affected device. An attacker could exploit this vulnerability by sending multiple crafted IPv6 packets to an affected device. A successful exploit could cause the network stack to run out of available buffers, impairing operations of control plane and management plane protocols and resulting in a DoS condition. Manual intervention would be required to restore normal operations on the affected device. For more information about the impact of this vulnerability, see the Details section of this advisory.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.42%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

0.00 pp

From 1.42% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.42%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco3 products
  • cisco nx-os softwaren/a
  • nx-os7.0\(0\)n1\(1\) | 7.0\(1\)n1\(1\) | 7.0\(2\)n1\(1\) | 7.0\(3\)n1\(1\) | 7.0\(4\)n1\(1\) | 7.0\(4\)n1\(1a\) | 7.0\(5\)n1\(1\) | 7.0\(5\)n1\(1a\) | 7.0\(6\)n1\(1\) | 7.0\(6\)n1\(2s\) | 7.0\(6\)n1\(3s\) | 7.0\(6\)n1\(4s\) | 7.0\(7\)n1\(1\) | 7.0\(7\)n1\(1a\) | 7.0\(7\)n1\(1b\) | 7.0\(8\)n1\(1\) | 7.0\(8\)n1\(1a\) | 7.1\(0\)n1\(1\) | 7.1\(0\)n1\(1a\) | 7.1\(0\)n1\(1b\) | 7.1\(1\)n1\(1\) | 7.1\(1\)n1\(1a\) | 7.1\(2\)n1\(1\) | 7.1\(2\)n1\(1a\) | 7.1\(3\)n1\(1\) | 7.1\(3\)n1\(2\) | 7.1\(3\)n1\(2a\) | 7.1\(3\)n1\(3\) | 7.1\(3\)n1\(4\) | 7.1\(3\)n1\(5\) | 7.1\(4\)n1\(1\) | 7.1\(4\)n1\(1a\) | 7.1\(4\)n1\(1c\) | 7.1\(4\)n1\(1d\) | 7.1\(5\)n1\(1\) | 7.1\(5\)n1\(1b\) | 7.2\(0\)n1\(1\) | 7.2\(1\)n1\(1\) | 7.3\(0\)n1\(1\) | 7.3\(0\)n1\(1a\) | 7.3\(0\)n1\(1b\) | 7.3\(1\)n1\(1\) | 7.3\(2\)n1\(1\) | 7.3\(2\)n1\(1b\) | 7.3\(2\)n1\(1c\) | 7.3\(3\)n1\(1\) | 7.3\(4\)n1\(1\) | 7.3\(4\)n1\(1a\) | 7.3\(5\)n1\(1\) | 7.3\(6\)n1\(1\) | 7.3\(6\)n1\(1a\) | 7.3\(7\)n1\(1\) | 7.3\(7\)n1\(1a\) | 7.3\(7\)n1\(1b\) | 6.0\(2\)a3\(1\) | 6.0\(2\)a3\(2\) | 6.0\(2\)a3\(4\) | 6.0\(2\)a4\(1\) | 6.0\(2\)a4\(2\) | 6.0\(2\)a4\(3\) | 6.0\(2\)a4\(4\) | 6.0\(2\)a4\(5\) | 6.0\(2\)a4\(6\) | 6.0\(2\)a6\(1\) | 6.0\(2\)a6\(1a\) | 6.0\(2\)a6\(2\) | 6.0\(2\)a6\(2a\) | 6.0\(2\)a6\(3\) | 6.0\(2\)a6\(3a\) | 6.0\(2\)a6\(4\) | 6.0\(2\)a6\(4a\) | 6.0\(2\)a6\(5\) | 6.0\(2\)a6\(5a\) | 6.0\(2\)a6\(5b\) | 6.0\(2\)a6\(6\) | 6.0\(2\)a6\(7\) | 6.0\(2\)a6\(8\) | 6.0\(2\)a7\(1\) | 6.0\(2\)a7\(1a\) | 6.0\(2\)a7\(2\) | 6.0\(2\)a7\(2a\) | 6.0\(2\)a8\(1\) | 6.0\(2\)a8\(2\) | 6.0\(2\)a8\(3\) | 6.0\(2\)a8\(4\) | 6.0\(2\)a8\(4a\) | 6.0\(2\)a8\(5\) | 6.0\(2\)a8\(6\) | 6.0\(2\)a8\(7\) | 6.0\(2\)a8\(7a\) | 6.0\(2\)a8\(7b\) | 6.0\(2\)a8\(8\) | 6.0\(2\)a8\(9\) | 6.0\(2\)a8\(10\) | 6.0\(2\)a8\(10a\) | 6.0\(2\)a8\(11\) | 6.0\(2\)a8\(11a\) | 6.0\(2\)a8\(11b\) | 6.0\(2\)u2\(1\) | 6.0\(2\)u2\(2\) | 6.0\(2\)u2\(3\) | 6.0\(2\)u2\(4\) | 6.0\(2\)u2\(5\) | 6.0\(2\)u2\(6\) | 6.0\(2\)u3\(1\) | 6.0\(2\)u3\(2\) | 6.0\(2\)u3\(3\) | 6.0\(2\)u3\(4\) | 6.0\(2\)u3\(5\) | 6.0\(2\)u3\(6\) | 6.0\(2\)u3\(7\) | 6.0\(2\)u3\(8\) | 6.0\(2\)u3\(9\) | 6.0\(2\)u4\(1\) | 6.0\(2\)u4\(2\) | 6.0\(2\)u4\(3\) | 6.0\(2\)u4\(4\) | 6.0\(2\)u5\(1\) | 6.0\(2\)u5\(2\) | 6.0\(2\)u5\(3\) | 6.0\(2\)u5\(4\) | 6.0\(2\)u6\(1\) | 6.0\(2\)u6\(1a\) | 6.0\(2\)u6\(2\) | 6.0\(2\)u6\(2a\) | 6.0\(2\)u6\(3\) | 6.0\(2\)u6\(3a\) | 6.0\(2\)u6\(4\) | 6.0\(2\)u6\(4a\) | 6.0\(2\)u6\(5\) | 6.0\(2\)u6\(5a\) | 6.0\(2\)u6\(5b\) | 6.0\(2\)u6\(5c\) | 6.0\(2\)u6\(6\) | 6.0\(2\)u6\(7\) | 6.0\(2\)u6\(8\) | 6.0\(2\)u6\(9\) | 6.0\(2\)u6\(10\) | 6.0\(2\)u6\(10a\) | 7.0\(3\)f3\(1\) | 7.0\(3\)f3\(2\) | 7.0\(3\)f3\(3\) | 7.0\(3\)f3\(3a\) | 7.0\(3\)f3\(3c\) | 7.0\(3\)f3\(4\) | 7.0\(3\)f3\(5\) | 7.0\(3\)i2\(1\) | 7.0\(3\)i2\(1a\) | 7.0\(3\)i2\(2\) | 7.0\(3\)i2\(2a\) | 7.0\(3\)i2\(2b\) | 7.0\(3\)i2\(2c\) | 7.0\(3\)i2\(2d\) | 7.0\(3\)i2\(2e\) | 7.0\(3\)i2\(2r\) | 7.0\(3\)i2\(2s\) | 7.0\(3\)i2\(2v\) | 7.0\(3\)i2\(2w\) | 7.0\(3\)i2\(2x\) | 7.0\(3\)i2\(2y\) | 7.0\(3\)i2\(3\) | 7.0\(3\)i2\(4\) | 7.0\(3\)i2\(5\) | 7.0\(3\)i3\(1\) | 7.0\(3\)i4\(1\) | 7.0\(3\)i4\(1t\) | 7.0\(3\)i4\(2\) | 7.0\(3\)i4\(3\) | 7.0\(3\)i4\(4\) | 7.0\(3\)i4\(5\) | 7.0\(3\)i4\(6\) | 7.0\(3\)i4\(6t\) | 7.0\(3\)i4\(7\) | 7.0\(3\)i4\(8\) | 7.0\(3\)i4\(8a\) | 7.0\(3\)i4\(8b\) | 7.0\(3\)i4\(8z\) | 7.0\(3\)i4\(9\) | 7.0\(3\)i5\(1\) | 7.0\(3\)i5\(2\) | 7.0\(3\)i5\(3\) | 7.0\(3\)i5\(3a\) | 7.0\(3\)i5\(3b\) | 7.0\(3\)i6\(1\) | 7.0\(3\)i6\(2\) | 7.0\(3\)i7\(1\) | 7.0\(3\)i7\(2\) | 7.0\(3\)i7\(3\) | 7.0\(3\)i7\(3z\) | 7.0\(3\)i7\(4\) | 7.0\(3\)i7\(5\) | 7.0\(3\)i7\(5a\) | 7.0\(3\)i7\(6\) | 7.0\(3\)i7\(6z\) | 7.0\(3\)i7\(7\) | 7.0\(3\)i7\(8\) | 7.0\(3\)ic4\(4\) | 7.0\(3\)im7\(2\) | 7.2\(0\)d1\(1\) | 7.2\(1\)d1\(1\) | 7.2\(2\)d1\(1\) | 7.2\(2\)d1\(2\) | 7.2\(2\)d1\(3\) | 7.2\(2\)d1\(4\) | 7.3\(0\)d1\(1\) | 7.3\(0\)dx\(1\) | 7.3\(1\)d1\(1\) | 7.3\(2\)d1\(1\) | 7.3\(2\)d1\(1d\) | 7.3\(2\)d1\(2\) | 7.3\(2\)d1\(3\) | 7.3\(2\)d1\(3a\) | 7.3\(3\)d1\(1\) | 7.3\(4\)d1\(1\) | 7.3\(5\)d1\(1\) | 7.3\(6\)d1\(1\) | 8.0\(1\) | 8.1\(1\) | 8.1\(2\) | 8.1\(2a\) | 8.2\(1\) | 8.2\(2\) | 8.2\(3\) | 8.2\(4\) | 8.2\(5\) | 8.3\(1\) | 8.3\(2\) | 8.4\(1\) | 8.4\(2\) | 7.0\(3\)f1\(1\) | 7.0\(3\)f2\(1\) | 7.0\(3\)f2\(2\) | 7.0\(3\)ia7\(1\) | 7.0\(3\)ia7\(2\) | 7.0\(3\)im3\(1\) | 7.0\(3\)im3\(2\) | 7.0\(3\)im3\(2a\) | 7.0\(3\)im3\(2b\) | 7.0\(3\)im3\(3\)
  • unified_computing_system≥ 4.0, < 4.0\(4k\) | ≥ 4.1, < 4.1\(1e\)

1 vendor · 3 products

References

1 links