CVE-2020-1059Network attack vector

Content spoofing via malformed HTTP responses

Published May 21, 2020 · Updated Aug 19, 2026

Spoofing in Microsoft Edge Legacy allows remote attackers to redirect users or falsify content through a crafted URL. The EdgeHTML HTTP parser incorrectly interprets crafted responses, permitting attacker-controlled navigation or content to appear associated with a trusted site. Exploitation requires a user to click the URL and interact with the resulting site; the direct impact is deceptive content or redirection, and the flaw can supply a pivot for chains with other web-service flaws.

CVSS severity4.3
Medium
EPSS probability2.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Spoofing in Microsoft Edge Legacy allows remote attackers to redirect users or falsify content through a crafted URL. The EdgeHTML HTTP parser incorrectly interprets crafted responses, permitting attacker-controlled navigation or content to appear associated with a trusted site. Exploitation requires a user to click the URL and interact with the resulting site; the direct impact is deceptive content or redirection, and the flaw can supply a pivot for chains with other web-service flaws.

The record

CVE
CVE-2020-1059
Published
May 21, 2020
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Microsoft Edge Legacy
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0..0 <publication

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Edge Legacyversion=1.0..0 <publication

Published CVSS scores

4.3Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo