CVE-2017-7856

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

LibreOffice before 2017-03-11 has an out-of-bounds write caused by a heap-based buffer overflow in the SVMConverter::ImplConvertFromSVM1 function in vcl/source/gdi/svmconverter.cxx.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
3.5%
EPSS %ILE
88th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 14, 2017

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Oct 5, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 28e61b634353 (LibreOffice/core)

Fix landed in LibreOffice/core commit 28e61b634353 — awaiting tagged release

https://github.com/LibreOffice/core/commit/28e61b634353110445e334ccaa415d7fb6629d62
generic
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=817
generic

CVE-2017-7856 - PSIRT.COM

http://www.securityfocus.com/bid/97667
generic

Security advisories — LibreOffice

http://www.libreoffice.org/about-us/security/advisories/cve-2017-7856/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 194 total refreshes for this CVE.

  1. 2026-10-10 19:55 UTCEPSS rescore
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  11. 2026-09-30 09:40 UTCEG score recompute
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  1. 2026-09-12 14:56 UTCEPSS rescore
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  11. 2026-08-28 21:36 UTCEPSS rescore
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  24. 2026-08-10 03:10 UTCOSV refresh
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  27. 2026-08-07 16:22 UTCEPSS rescore
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  39. 2026-07-25 03:41 UTCOSV refresh
  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 01:30 UTCEG score recompute
  42. 2026-07-22 22:10 UTCEG score recompute
  43. 2026-07-22 14:04 UTCEPSS rescore
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  64. 2026-07-07 22:42 UTCOSV refresh
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  74. 2026-06-30 23:19 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2017-7856?
CVE-2017-7856 is a critical vulnerability published on April 14, 2017. LibreOffice before 2017-03-11 has an out-of-bounds write caused by a heap-based buffer overflow in the SVMConverter::ImplConvertFromSVM1 function in vcl/source/gdi/svmconverter.cxx.
When was CVE-2017-7856 disclosed?
CVE-2017-7856 was first published on April 14, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-7856 actively exploited?
CVE-2017-7856 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.5% probability of exploitation in the next 30 days (88th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-7856?
CVE-2017-7856 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-7856?
An upstream fix for CVE-2017-7856 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix.

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