What is CVE-2016-1376?

CVE-2016-1376 is a medium-severity vulnerability in Cisco iOS Xr, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2016-04-12.

How severe is CVE-2016-1376?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in Cisco iOS Xr

CVE-2016-1376

Cisco IOS XR 4.2.3, 4.3.0, 4.3.4, and 5.3.1 on ASR 9000 devices allows remote attackers to cause a denial of service (CRC and symbol errors, and interface flap) via crafted bit patterns in packets, aka Bug ID CSCuv78548.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2016-04-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.017 (76.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Cisco iOS Xr — versions 4.2.3, 4.3.0, 4.3.4

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.securitytracker.com/id/1035560 (vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160412… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2016-1376?: CVE-2016-1376 is a medium-severity vulnerability in Cisco iOS Xr, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2016-04-12.
How severe is CVE-2016-1376?: Medium severity. CVSS v3 base score is 5.3 out of 10.