8.6

CVE-2021-1446: cisco cisco ios xe software

CVSS: 8.6v3.1HighModified
Published 24-03-2021Last modified 08-11-2024
Open JSON

Vulnerability summary

CVE-2021-1446 is a high (CVSS 8.6) vulnerability in cisco cisco ios xe software. EPSS estimates a 1.55% chance of exploitation in the next 30 days, higher than 74.7% 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
1.55%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-03-2021
    PublishedVulnerability first disclosed.
  2. 08-11-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.55%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

+0.05 pp

From 1.49% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.55%

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

Cisco2 products
  • cisco ios xe softwaren/a
  • ios_xe3.7.0bs | 3.7.0s | 3.7.0xas | 3.7.0xbs | 3.7.1as | 3.7.1s | 3.7.2s | 3.7.2ts | 3.7.3s | 3.7.4as | 3.7.4s | 3.7.5s | 3.7.6s | 3.7.7s | 3.7.8s | 3.8.0s | 3.8.1s | 3.8.2s | 3.9.0as | 3.9.0s | 3.9.0xas | 3.9.1as | 3.9.1s | 3.9.2s | 3.10.0s | 3.10.1s | 3.10.1xbs | 3.10.1xcs | 3.10.2as | 3.10.2s | 3.10.2ts | 3.10.3s | 3.10.4s | 3.10.5s | 3.10.6s | 3.10.7s | 3.10.8as | 3.10.8s | 3.10.9s | 3.10.10s | 3.11.0s | 3.11.1s | 3.11.2s | 3.11.3s | 3.11.4s | 3.12.0as | 3.12.0s | 3.12.1s | 3.12.2s | 3.12.3s | 3.12.4s | 3.13.0as | 3.13.0s | 3.13.1s | 3.13.2as | 3.13.2s | 3.13.3s | 3.13.4s | 3.13.5as | 3.13.5s | 3.13.6as | 3.13.6bs | 3.13.6s | 3.13.7as | 3.13.7s | 3.13.8s | 3.13.9s | 3.13.10s | 3.14.0s | 3.14.1s | 3.14.2s | 3.14.3s | 3.14.4s | 3.15.0s | 3.15.1cs | 3.15.1s | 3.15.1xbs | 3.15.2s | 3.15.2xbs | 3.15.3s | 3.15.4s | 3.16.0as | 3.16.0bs | 3.16.0cs | 3.16.0s | 3.16.1as | 3.16.1s | 3.16.2as | 3.16.2bs | 3.16.2s | 3.16.3as | 3.16.3s | 3.16.4as | 3.16.4bs | 3.16.4cs | 3.16.4ds | 3.16.4es | 3.16.4gs | 3.16.4s | 3.16.5as | 3.16.5bs | 3.16.5s | 3.16.6bs | 3.16.6s | 3.16.7as | 3.16.7bs | 3.16.7s | 3.16.8s | 3.16.9s | 3.16.10as | 3.16.10s | 3.17.0s | 3.17.1as | 3.17.1s | 3.17.2s | 3.17.3s | 3.17.4s | 3.18.0as | 3.18.0s | 3.18.0sp | 3.18.1asp | 3.18.1bsp | 3.18.1csp | 3.18.1gsp | 3.18.1hsp | 3.18.1isp | 3.18.1s | 3.18.1sp | 3.18.2asp | 3.18.2s | 3.18.2sp | 3.18.3asp | 3.18.3bsp | 3.18.3s | 3.18.3sp | 3.18.4s | 3.18.4sp | 3.18.5sp | 3.18.6sp | 3.18.7sp | 3.18.8asp | 3.18.8sp | 16.1.1 | 16.1.2 | 16.1.3 | 16.2.1 | 16.2.2 | 16.3.1 | 16.3.1a | 16.3.2 | 16.3.3 | 16.3.4 | 16.3.5 | 16.3.5b | 16.3.6 | 16.3.7 | 16.3.8 | 16.3.9 | 16.3.10 | 16.3.11 | 16.4.1 | 16.4.2 | 16.4.3 | 16.5.1 | 16.5.1a | 16.5.1b | 16.5.2 | 16.5.3 | 16.6.1 | 16.6.2 | 16.6.3 | 16.6.4 | 16.6.4a | 16.6.4s | 16.6.5 | 16.6.5a | 16.6.5b | 16.6.6 | 16.6.7 | 16.6.7a | 16.6.8 | 16.7.1 | 16.7.1a | 16.7.1b | 16.7.2 | 16.7.3 | 16.7.4 | 16.8.1 | 16.8.1a | 16.8.1b | 16.8.1c | 16.8.1d | 16.8.1e | 16.8.1s | 16.8.2 | 16.8.3 | 16.9.1 | 16.9.1a | 16.9.1b | 16.9.1c | 16.9.1d | 16.9.1s | 16.9.2 | 16.9.2a | 16.9.2s | 16.9.3 | 16.9.3a | 16.9.3h | 16.9.3s | 16.9.4 | 16.9.4c | 16.9.5 | 16.9.5f | 16.9.6 | 16.10.1 | 16.10.1a | 16.10.1b | 16.10.1c | 16.10.1d | 16.10.1e | 16.10.1f | 16.10.1g | 16.10.1s | 16.10.2 | 16.10.3 | 16.11.1 | 16.11.1a | 16.11.1b | 16.11.1c | 16.11.1s | 16.11.2 | 16.12.1 | 16.12.1a | 16.12.1c | 16.12.1s | 16.12.1t | 16.12.1w | 16.12.1x | 16.12.1y | 16.12.1z | 16.12.1z1 | 16.12.1za | 16.12.2 | 16.12.2a | 16.12.2s | 16.12.2t | 16.12.3 | 16.12.3a | 16.12.3s | 16.12.4 | 16.12.4a | 17.1.1 | 17.1.1a | 17.1.1s | 17.1.1t | 17.1.2 | 17.2.1 | 17.2.1a | 17.2.1r | 17.2.1v | 17.2.2 | 17.2.3 | 17.3.1 | 17.3.1a | 17.3.1w

1 vendor · 2 products

References

1 links