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TI-2020-02806 Aliases CVE-2020-3246GHSA-j53q-vx25-fmqm

Cisco Umbrella Carriage Return Line Feed Injection Vulnerability

Priority LOW 22CWE-93Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

A vulnerability in the web server of Cisco Umbrella could allow an unauthenticated, remote attacker to perform a carriage return line feed (CRLF) injection attack against a user of an affected service. The vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user to access a crafted URL. A successful exploit could allow the attacker to inject arbitrary HTTP headers into valid HTTP responses sent to the browser of the user.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.009 59th percentileScored 2026-11-08
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Umbrellaall versions—No fix listedCNA
  • Cisco Umbrella VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cisco:umbrella:*:*:*:*:*:*:*:*all versionsVulnerableCisco
  • cpe:2.3:a:cisco:umbrella:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-3246
  2. 2026-10-03 Alias added: GHSA-j53q-vx25-fmqm

References

Advisory 1

  • TI-2019-01430 Cisco Umbrella Dashboard Session Management Vulnerability CVSS 3.0HIGH 8.8
  • TI-2018-00394 Cisco Umbrella API Unauthorized Access Vulnerability CVSS 3.0CRITICAL 9.1
  • TI-2021-01201 Cisco Umbrella Link and CSV Formula Injection Vulnerabilities CVSS 3.1HIGH 8.6
  • TI-2021-01077 Cisco Umbrella Dashboard Packet Flood Vulnerability CVSS 3.1MEDIUM 5.3
  • TI-2021-01202 Cisco Umbrella Link and CSV Formula Injection Vulnerabilities CVSS 3.1MEDIUM 6.5
  • TI-2019-01417 Cisco Umbrella Cross-Site Scripting Vulnerability CVSS 3.1MEDIUM 6.1
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences