# CVE-2017-8570 — Microsoft Office 2007 SP3, Microsoft Office 2010 SP2, Microsoft Office 2013 SP1, and Microsoft Office 2016.

**CISA KEV**

> As of 2025-10-21, CVE-2017-8570 is a HIGH-severity vulnerability in Microsoft Office 2007 SP3, Microsoft Office 2010 SP2, Microsoft Office 2013 SP1, and Microsoft Office 2016., CVSS v3.1 7.8, EPSS 89.8% (99.7th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-25), with a US federal remediation deadline of 2022-08-25. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2017-8570, most recently “Agent Tesla .NET Remote Access Trojan — Credential and Data Theft via Keylogging and MaaS Operations”.

**Last updated:** 2025-10-21

## What is CVE-2017-8570?

Microsoft Office allows a remote code execution vulnerability due to the way that it handles objects in memory, aka "Microsoft Office Remote Code Execution Vulnerability". This CVE ID is unique from CVE-2017-0243.

Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 3359 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.8 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 89.8% probability of exploitation in the next 30 days, higher than 99.7% of all scored CVEs
- **CISA KEV:** Listed since 2022-02-25, federal remediation deadline 2022-08-25
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2017-07-11, last modified 2025-10-21

## Is CVE-2017-8570 being exploited?

CISA added CVE-2017-8570 to the Known Exploited Vulnerabilities catalog on 2022-02-25, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-08-25 under BOD 22-01. Weaponised exploit code for CVE-2017-8570 is publicly available. 8 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 43 in the Threadlinqs vulnerability feed.

- [rxwx/CVE-2017-8570](https://github.com/rxwx/CVE-2017-8570) (github)
- [temesgeny/ppsx-file-generator](https://github.com/temesgeny/ppsx-file-generator) (github)
- [SwordSheath/CVE-2017-8570](https://github.com/SwordSheath/CVE-2017-8570) (github)
- [Drac0nids/CVE-2017-8570](https://github.com/Drac0nids/CVE-2017-8570) (github)
- [erfze/CVE-2017-8570](https://github.com/erfze/CVE-2017-8570) (github)
- [MaxSecurity/Office-CVE-2017-8570](https://github.com/MaxSecurity/Office-CVE-2017-8570) (github)
- [sasqwatch/CVE-2017-8570](https://github.com/sasqwatch/CVE-2017-8570) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2017/CVE-2017-8570.md) (trickest)

## Affected products and versions

- **Microsoft Corporation**: Microsoft Office 2007 SP3, Microsoft Office 2010 SP2, Microsoft Office 2013 SP1, and Microsoft Office 2016.

## How to fix CVE-2017-8570

The record marks a vendor fix as available for CVE-2017-8570. Patch reference: [https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570](https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570). Vendor advisory: [https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570](https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570). Because CVE-2017-8570 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-08-25. 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-2017-8570

1 tracked threat in the Threadlinqs corpus references CVE-2017-8570, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Agent Tesla .NET Remote Access Trojan — Credential and Data Theft via Keylogging and MaaS Operations](https://intel.threadlinqs.com/threat/TL-2026-0912) — HIGH · 2026-06-23

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-06-25. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [portal.msrc.microsoft.com](https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8570)

**Vulnerability database entry**

- [securityfocus.com — vdb entry](http://www.securityfocus.com/bid/99445)

**Other references**

- [github.com](https://github.com/rxwx/CVE-2017-8570)
- [github.com (Office8570)](https://github.com/tezukanice/Office8570)
- [github.com (ppsx file generator)](https://github.com/ParsingTeam/ppsx-file-generator)

Canonical: https://intel.threadlinqs.com/cve/CVE-2017-8570
Full detection coverage and IOCs for threats exploiting CVE-2017-8570 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp