Is CVE-2020-26070 actively exploited?

No active exploitation of CVE-2020-26070 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-26070 be exploited remotely?

Yes. CVE-2020-26070 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-26070?

CVE-2020-26070 has a CVSS score of 8.6 (HIGH).

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HIGH

CVE-2020-26070

CWE-404Published: November 12, 2020· Updated: Jun 17, 2026

8.6

CVSS v3.1

Official Description

A vulnerability in the ingress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper resource allocation when an affected device processes network traffic in software switching mode (punted). An attacker could exploit this vulnerability by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device. A successful exploit could cause the affected device to run out of buffer resources, which could make the device unable to process or forward traffic, resulting in a DoS condition. The device would need to be restarted to regain functionality.

NVD Source

Technical Analysis

CVE-2020-26070 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.