CVE-2024-56520Network attack vector

Unspecified impact via raw FontBBox parsing

Published Dec 27, 2024 · Updated Nov 3, 2025

Improper font parsing in TCPDF before 6.8.0 allows attackers to trigger unspecified impact through crafted Type 1 font data. TCPDF_FONTS::addTTFfont splits FontBBox text into space-delimited fields and, before the patch, retains the raw bounding-box string instead of normalizing all four coordinates as integers. The path is reached only when an application imports attacker-influenced Type 1 or TrueType font data; public records do not define the resulting operational consequence.

CVSS severity7.3
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper font parsing in TCPDF before 6.8.0 allows attackers to trigger unspecified impact through crafted Type 1 font data. TCPDF_FONTS::addTTFfont splits FontBBox text into space-delimited fields and, before the patch, retains the raw bounding-box string instead of normalizing all four coordinates as integers. The path is reached only when an application imports attacker-influenced Type 1 or TrueType font data; public records do not define the resulting operational consequence.

The record

CVE
CVE-2024-56520
Published
Dec 27, 2024
Updated
Nov 3, 2025
Vendor
Tecnick.com LTD
Product
TCPDF
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=0 <6.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tecnick.com LTD · TCPDFversion=0 <6.8.0

Published CVSS scores

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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

No sourced classifications are available.

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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