# CVE-2018-25273: CrossFont 7.5 Denial of Service via License Key Field

> Local attackers can crash CrossFont by submitting an oversized payload in the License Key field, causing a denial of service.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Apr 2026
- **Updated:** 27 Apr 2026
- **Also known as:** GHSA-624p-p24w-cmj7

## What is CVE-2018-25273?

CVE-2018-25273 is a medium-severity memory corruption vulnerability in Acutesystems CrossFont, published on 26 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

CrossFont 7.5 contains a buffer overflow vulnerability that allows local attackers to crash the application by submitting an oversized payload in the License Key field. Attackers can generate a malicious file containing 4000 bytes of data, paste it into the License Key input field, and trigger an application crash when processing the input.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2018-25273?


## How do I fix CVE-2018-25273?

No fix has been published for CVE-2018-25273 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-25273 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25273 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-25273 and fix it if it is affected.

What it is: CVE-2018-25273 is a medium-severity memory corruption vulnerability in Acutesystems CrossFont, published on 26 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25273 exists.

Affected product: Acutesystems CrossFont. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2018-25273/ (Markdown: https://insights.sbomify.com/CVE-2018-25273/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-25273
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-25273
- OSV: https://osv.dev/vulnerability/CVE-2018-25273

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-25273/
Summaries are generated and may contain mistakes; the official description above is the record.