CVE-2020-19613Public exploitNetwork attack vector

Internal resource disclosure via unchecked image URL

Published Apr 1, 2021 · Updated Aug 4, 2024

Server-side request forgery in sunkaifei FlyCMS 20190503 allows remote attackers to read internal resources through crafted question content. ImagesService.saveUrlAs opens an image URL extracted by replaceContent with HttpURLConnection after a 127.1 loopback form bypasses the URL check. Reachability requires the question-creation endpoint to accept crafted content, and successful requests originate from the FlyCMS server and can expose saved response data.

CVSS severity7.5
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in sunkaifei FlyCMS 20190503 allows remote attackers to read internal resources through crafted question content. ImagesService.saveUrlAs opens an image URL extracted by replaceContent with HttpURLConnection after a 127.1 loopback form bypasses the URL check. Reachability requires the question-creation endpoint to accept crafted content, and successful requests originate from the FlyCMS server and can expose saved response data.

The record

CVE
CVE-2020-19613
Published
Apr 1, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2021CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

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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