# CVE-2018-21028 — Boa

> As of 2024-08-05, CVE-2018-21028 is a HIGH-severity vulnerability in Boa, CVSS v3.1 7.5, EPSS 2.0% (80.8th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2018-21028, most recently “PoeLLM (Canto Incognito) malware infects exposed AI servers (LiteLLM, Ollama, Gotenberg, Gitea, Ivanti Sentry) in cryptomining attacks - CVE-2026-42271, CVE-2026-48710”.

**Last updated:** 2024-08-05

## What is CVE-2018-21028?

Boa through 0.94.14rc21 allows remote attackers to trigger a memory leak because of missing calls to the free function.

The record classifies CVE-2018-21028 under weakness class [CWE-772](https://cwe.mitre.org/data/definitions/772.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 2558 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **EPSS (FIRST):** 2.0% probability of exploitation in the next 30 days, higher than 80.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2019-10-11, last modified 2024-08-05

## Is CVE-2018-21028 being exploited?

It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Boa**: Boa

## How to fix CVE-2018-21028

The record marks a vendor fix as available for CVE-2018-21028. Patch reference: [https://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e](https://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2018-21028

1 tracked threat in the Threadlinqs corpus references CVE-2018-21028, either in the campaign’s CVE list or as an indicator on the campaign record.

- [PoeLLM (Canto Incognito) malware infects exposed AI servers (LiteLLM, Ollama, Gotenberg, Gitea, Ivanti Sentry) in cryptomining attacks - CVE-2026-42271, CVE-2026-48710](https://intel.threadlinqs.com/threat/TL-2026-3010) — HIGH · 2026-10-07

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/gpg/boa/pull/1)
- [github.com (e139b87835994d007fbd64eead6c1455d7b8cf4e)](https://github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e)

Canonical: https://intel.threadlinqs.com/cve/CVE-2018-21028
Full detection coverage and IOCs for threats exploiting CVE-2018-21028 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp