CVE-2020-28463Public exploitNetwork attack vector

Internal resource access via unrestricted image URLs

Published Feb 18, 2021 · Updated Sep 17, 2024

SSRF in ReportLab Toolkit before 3.5.55 allows remote authenticated users to access internal URLs through crafted image tags. The paragraph image handler passes the src value to reportlab.lib.utils.open_for_read, which calls urlopen without restricting the destination host. An application must accept attacker-controlled paragraph markup and render it; successful requests originate from the application's network context and expose reachable internal image data.

CVSS severity7.1
High
EPSS probability1.49%
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

SSRF in ReportLab Toolkit before 3.5.55 allows remote authenticated users to access internal URLs through crafted image tags. The paragraph image handler passes the src value to reportlab.lib.utils.open_for_read, which calls urlopen without restricting the destination host. An application must accept attacker-controlled paragraph markup and render it; successful requests originate from the application's network context and expose reachable internal image data.

The record

CVE
CVE-2020-28463
Published
Feb 18, 2021
Updated
Sep 17, 2024
Vendor
ReportLab Europe Ltd
Product
ReportLab Toolkit
Classifications
CWE-918
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ReportLab Europe Ltd · ReportLab Toolkitversion=0 <unspecified

Published CVSS scores

7.1GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

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