Is CVE-2020-1647 being actively exploited?

CVE-2020-1647 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2020-1647?

CVE-2020-1647 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2020-1647

CRITICAL · CVSS 9.8EPSS 2.6%EU EUVD

On Juniper Networks SRX Series with ICAP (Internet Content Adaptation Protocol) redirect service enabled, a double free vulnerability can lead to a Denial of Service (DoS) or Remote Code Execution (RCE) due to processing of a specific HTTP message. Continued processing of this specific HTTP message may result in an extended Denial of Service (DoS). The offending HTTP message that causes this issue may originate both from the HTTP server or the client. This issue affects Juniper Networks Junos OS on SRX Series: 18.1 versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R3-S3; 18.3 versions prior to 18.3R2-S4, 18.3R3-S1; 18.4 versions prior to 18.4R2-S5, 18.4R3; 19.1 versions prior to 19.1R2; 19.2 versions prior to 19.2R1-S2, 19.2R2; 19.3 versions prior to 19.3R2. This issue does not affect Juniper Networks Junos OS prior to 18.1R1.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-415
EPSS score: 2.6% (85th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2020-12512)
Published: July 17, 2020
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2020-12512 in the EU Vulnerability Database. Last updated in EUVD on September 17, 2024.

View on the EU Vulnerability Database

Affected products

juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos
juniper / junos

and 15 more…

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Junos Space Network Management Platform, with or without Network Director and with or without Security Director in JA2500 - Juniper Networks, Inc. - FIPS 140 3816 - historical

References

https://kb.juniper.net/JSA11034(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain