CVE-2020-9753Network attack vector

Unsigned Flash installation via missing signature verification

Published May 20, 2020 · Updated Aug 4, 2024

Improper signature verification in NAVER Whale Browser before 1.2.0.5 allows remote attackers to supply an untrusted Flash installer over a network. The browser installer accepts the Flash installer without validating its cryptographic signature. No authentication or user interaction is required, and attacker-supplied installer content runs with the installer's access.

CVSS severity9.1
Critical
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in NAVER Whale Browser before 1.2.0.5 allows remote attackers to supply an untrusted Flash installer over a network. The browser installer accepts the Flash installer without validating its cryptographic signature. No authentication or user interaction is required, and attacker-supplied installer content runs with the installer's access.

The record

CVE
CVE-2020-9753
Published
May 20, 2020
Updated
Aug 4, 2024
Vendor
NAVER Corporation
Product
NAVER Whale Browser
Classifications
CWE-347
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <1.2.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NAVER Corporation · NAVER Whale Browserversion=unspecified <1.2.0.5

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:N
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature

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

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Your stack

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