CVE-2017-5447

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.1EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 17%CVSS: 9.1Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed services: Not assessed

A fix is available — apply it.

An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
71
EG Risk 71/100CISA 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
Severity91% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
17%
EPSS %ILE
97th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · 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

June 11, 2018

Last Modified

November 25, 2025

Advisory Details (10)

Auto-updated Aug 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: redhat.
generic

Security vulnerabilities fixed in Firefox ESR 45.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2017-11/
generic

Security vulnerabilities fixed in Firefox 53 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2017-10/
generic🟡 PoC Available

Mozilla Firefox < 53 - 'gfxTextRun' Out-of-Bounds Read - Multiple dos Exploit

https://www.exploit-db.com/exploits/42071/
generic

[SECURITY] [DSA 3831-1] firefox-esr security update

https://www.debian.org/security/2017/dsa-3831
generic🔴 Active Exploitation

1343552 - (CVE-2017-5447) ASAN: out-of-bounds read in gfxTextRun (after "ASSERTION: Invalid offset" and "ASSERTION: Substring out of range")

https://bugzilla.mozilla.org/show_bug.cgi?id=1343552
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2017:1201
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2017:1106
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2017:1104
generic
http://www.securitytracker.com/id/1038320
generic

SecurityFocus

http://www.securityfocus.com/bid/97940

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuthunderbird (1:52.1.1+build1-0ubuntu0.17.04.1) @ zesty2026-05-28ubuntu
ubuntufirefox (53.0+build6-0ubuntu0.17.04.1) @ zesty2026-05-28ubuntu
redhatthunderbird-0:52.1.0-1.el7_32017-05-08redhat
redhatfirefox-0:52.1.0-2.el7_32017-04-21redhat
redhatfirefox-0:52.1.0-2.el6_92017-04-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.9.0esr-1: fixed in 45.9.0esr-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.9.0esr-1: fixed in 45.9.0esr-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.9.0esr-1: fixed in 45.9.0esr-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.9.0esr-1: fixed in 45.9.0esr-1
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.0.1esr-1 ... 45.8.0esr-1~deb8u1 (36 versions)
  • every version up to 45.9.0esr-1~deb7u1: fixed in 45.9.0esr-1~deb7u1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.0.1esr-1 ... 45.9.0esr-1~deb7u1 (37 versions)
  • every version up to 45.9.0esr-1~deb8u1: fixed in 45.9.0esr-1~deb8u1
—

Weakness Classification(1)

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

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 23× 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 140 total refreshes for this CVE.

  1. 2026-10-10 19:55 UTCEPSS rescore
  2. 2026-10-09 20:02 UTCEPSS rescore
  3. 2026-10-08 16:36 UTCEPSS rescore
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  9. 2026-09-30 14:59 UTCEPSS rescore
  10. 2026-09-30 09:34 UTCEG score recompute
  11. 2026-09-29 02:08 UTCOSV refresh
  12. 2026-09-28 13:45 UTCEPSS rescore
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  24. 2026-09-09 07:11 UTCOSV refresh
  25. 2026-09-07 15:56 UTCEPSS rescore
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  1. 2026-09-06 13:43 UTCEPSS rescore
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  6. 2026-08-30 19:13 UTCEPSS rescore
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  8. 2026-08-26 14:41 UTCEPSS rescore
  9. 2026-08-25 13:44 UTCEPSS rescore
  10. 2026-08-22 15:37 UTCOSV refresh
  11. 2026-08-21 23:44 UTCEPSS rescore
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  13. 2026-08-19 16:59 UTCEPSS rescore
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  19. 2026-08-12 13:46 UTCEPSS rescore
  20. 2026-08-07 16:22 UTCEPSS rescore
  21. 2026-08-06 19:35 UTCOSV refresh
  22. 2026-08-06 13:42 UTCEPSS rescore
  23. 2026-08-05 19:12 UTCEPSS rescore
  24. 2026-08-04 15:05 UTCEPSS rescore
  25. 2026-08-02 02:23 UTCEPSS rescore
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  27. 2026-07-30 16:24 UTCEPSS rescore
  28. 2026-07-28 15:32 UTCEPSS rescore
  29. 2026-07-26 14:51 UTCEPSS rescore
  30. 2026-07-23 14:15 UTCEPSS rescore
  31. 2026-07-23 01:29 UTCEG score recompute
  32. 2026-07-22 22:09 UTCEG score recompute
  33. 2026-07-22 14:04 UTCEPSS rescore
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  35. 2026-07-21 15:21 UTCEPSS rescore
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  37. 2026-07-21 11:18 UTCOSV refresh
  38. 2026-07-20 17:04 UTCEPSS rescore
  39. 2026-07-19 14:28 UTCEPSS rescore
  40. 2026-07-19 14:28 UTCEPSS rescore
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  44. 2026-07-16 16:59 UTCEPSS rescore
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  46. 2026-07-15 16:54 UTCEPSS rescore
  47. 2026-07-15 01:56 UTCEPSS rescore
  48. 2026-07-15 01:56 UTCEPSS rescore
  49. 2026-07-13 22:26 UTCEPSS rescore
  50. 2026-07-12 05:43 UTCEPSS rescore
  51. 2026-07-11 08:24 UTCEPSS rescore
  52. 2026-07-09 19:06 UTCEPSS rescore
  53. 2026-07-08 15:10 UTCEPSS rescore
  54. 2026-07-07 13:42 UTCEPSS rescore
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  57. 2026-07-05 02:27 UTCEPSS rescore
  58. 2026-07-04 06:56 UTCOSV refresh
  59. 2026-07-02 16:54 UTCEPSS rescore
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  61. 2026-06-30 23:19 UTCEPSS rescore
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  63. 2026-06-28 14:04 UTCEPSS rescore
  64. 2026-06-28 04:53 UTCEPSS rescore
  65. 2026-06-27 03:06 UTCEPSS rescore
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  67. 2026-06-25 13:47 UTCEPSS rescore
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  70. 2026-06-23 21:30 UTCEPSS rescore
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  73. 2026-06-21 14:54 UTCEPSS rescore
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  75. 2026-06-21 01:57 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-42071✓ verified
    First seen May 25, 2017

    Mozilla Firefox < 53 - 'gfxTextRun' Out-of-Bounds Read

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2017-5447?
CVE-2017-5447 is a critical vulnerability published on June 11, 2018. An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
When was CVE-2017-5447 disclosed?
CVE-2017-5447 was first published on June 11, 2018, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-5447 actively exploited?
CVE-2017-5447 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 17% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-5447?
CVE-2017-5447 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2017-5447?
A fix for CVE-2017-5447 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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