# CVE-2018-21027 — Boa

> As of 2024-08-05, CVE-2018-21027 is a CRITICAL-severity vulnerability in Boa, CVSS v3.1 9.8, EPSS 2.3% (83.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2018-21027, 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-2018-21027?

Boa through 0.94.14rc21 allows remote attackers to trigger an out-of-memory (OOM) condition because malloc is mishandled.

The record classifies CVE-2018-21027 under weakness class [CWE-119](https://intel.threadlinqs.com/cwe/CWE-119). 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 confidentiality, integrity, 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:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 2.3% probability of exploitation in the next 30 days, higher than 83.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 8.2/10 — 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-2018-21027 being exploited?

It currently carries a trending score of 26 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Boa**: Boa

## How to fix CVE-2018-21027

The record marks a vendor fix as available for CVE-2018-21027. 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-2018-21027

1 tracked threat in the Threadlinqs corpus references CVE-2018-21027, 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-2018-21027
Full detection coverage and IOCs for threats exploiting CVE-2018-21027 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp