CVE-2017-7818

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

A use-after-free vulnerability can occur when manipulating arrays of Accessible Rich Internet Applications (ARIA) elements within containers through the DOM. This results in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS
87.7%
KEV
Not listed

Published

June 11, 2018

Last Modified

November 25, 2025

Advisory Details (10)

Auto-updated May 29, 2026
Patch available. Sources: redhat.
generic

Security vulnerabilities fixed in Firefox 56 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2017-21/
generic

[SECURITY] [DSA 4014-1] thunderbird security update

https://www.debian.org/security/2017/dsa-4014
generic

[SECURITY] [DSA 3987-1] firefox-esr security update

https://www.debian.org/security/2017/dsa-3987
generic

Mozilla Thunderbird: Multiple vulnerabilities (GLSA 201803-14) — Gentoo security

https://security.gentoo.org/glsa/201803-14
generic Patch Available

[SECURITY] [DLA 1153-1] icedove/thunderbird security update

https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
generic

1363723 - (CVE-2017-7818) heap-use-after-free in mozilla::a11y::DocAccessible::DoARIAOwnsRelocation

https://bugzilla.mozilla.org/show_bug.cgi?id=1363723
redhat Patch Available

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

https://access.redhat.com/errata/RHSA-2017:2885
redhat Patch Available

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

https://access.redhat.com/errata/RHSA-2017:2831
generic
http://www.securitytracker.com/id/1039465
generic
http://www.securityfocus.com/bid/101055

Vendor Advisories for CVE-2017-7818(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuthunderbird (1:52.4.0+build1-0ubuntu0.17.04.2) @ zesty2026-05-28ubuntu
ubuntufirefox-testsuite (56.0+build6-0ubuntu0.14.04.1) @ trusty2026-05-28ubuntu
redhatthunderbird-0:52.4.0-2.el7_42017-10-11redhat
redhatfirefox-0:52.4.0-1.el7_42017-09-28redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 47× 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.

  1. 2026-07-23 01:30 UTCEG score recompute
  2. 2026-07-22 22:10 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-21 15:21 UTCEPSS rescore
  5. 2026-07-21 10:48 UTCOSV refresh
  6. 2026-07-20 17:04 UTCEPSS rescore
  7. 2026-07-20 17:04 UTCEPSS rescore
  8. 2026-07-19 14:28 UTCEPSS rescore
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  10. 2026-07-19 02:26 UTCEPSS rescore
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  12. 2026-07-18 10:01 UTCEPSS rescore
  13. 2026-07-16 16:59 UTCEPSS rescore
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  15. 2026-07-15 16:55 UTCEPSS rescore
  16. 2026-07-15 16:54 UTCEPSS rescore
  17. 2026-07-15 01:56 UTCEPSS rescore
  18. 2026-07-15 01:56 UTCEPSS rescore
  19. 2026-07-13 22:26 UTCEPSS rescore
  20. 2026-07-13 22:26 UTCEPSS rescore
  21. 2026-07-12 05:43 UTCEPSS rescore
  22. 2026-07-11 08:24 UTCEPSS rescore
  23. 2026-07-09 19:06 UTCEPSS rescore
  24. 2026-07-08 15:11 UTCEPSS rescore
  25. 2026-07-07 13:42 UTCEPSS rescore
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  1. 2026-07-06 16:24 UTCEPSS rescore
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  3. 2026-07-06 02:20 UTCEPSS rescore
  4. 2026-07-06 02:20 UTCEPSS rescore
  5. 2026-07-05 02:27 UTCEPSS rescore
  6. 2026-07-04 06:28 UTCEPSS rescore
  7. 2026-07-04 06:28 UTCEPSS rescore
  8. 2026-07-04 06:26 UTCOSV refresh
  9. 2026-07-02 16:54 UTCEPSS rescore
  10. 2026-07-01 15:03 UTCEPSS rescore
  11. 2026-06-30 23:19 UTCEPSS rescore
  12. 2026-06-30 23:19 UTCEPSS rescore
  13. 2026-06-29 14:03 UTCEPSS rescore
  14. 2026-06-28 14:04 UTCEPSS rescore
  15. 2026-06-28 04:53 UTCEPSS rescore
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  17. 2026-06-27 03:06 UTCEPSS rescore
  18. 2026-06-25 13:47 UTCEPSS rescore
  19. 2026-06-24 14:02 UTCEPSS rescore
  20. 2026-06-24 14:02 UTCEPSS rescore
  21. 2026-06-23 21:30 UTCEPSS rescore
  22. 2026-06-23 21:30 UTCEPSS rescore
  23. 2026-06-22 14:23 UTCEPSS rescore
  24. 2026-06-22 14:23 UTCEPSS rescore
  25. 2026-06-21 01:57 UTCEPSS rescore
  26. 2026-06-21 01:57 UTCEPSS rescore
  27. 2026-06-19 19:23 UTCEPSS rescore
  28. 2026-06-19 19:23 UTCEPSS rescore
  29. 2026-06-18 17:50 UTCEPSS rescore
  30. 2026-06-17 17:50 UTCEPSS rescore
  31. 2026-06-16 17:50 UTCEPSS rescore
  32. 2026-06-15 18:13 UTCOSV refresh
  33. 2026-06-15 17:45 UTCEPSS rescore
  34. 2026-06-14 23:14 UTCEPSS rescore
  35. 2026-06-14 23:14 UTCEPSS rescore
  36. 2026-06-13 22:58 UTCEPSS rescore
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  38. 2026-06-12 23:09 UTCEPSS rescore
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  40. 2026-06-11 13:57 UTCEPSS rescore
  41. 2026-06-10 22:15 UTCEPSS rescore
  42. 2026-06-10 13:19 UTCEPSS rescore
  43. 2026-06-08 14:14 UTCEPSS rescore
  44. 2026-06-08 14:14 UTCEPSS rescore
  45. 2026-06-07 15:22 UTCEPSS rescore
  46. 2026-06-07 15:22 UTCEPSS rescore
  47. 2026-06-06 13:45 UTCEPSS rescore
  48. 2026-06-06 13:45 UTCEPSS rescore
  49. 2026-06-05 22:44 UTCEPSS rescore
  50. 2026-06-05 22:44 UTCEPSS rescore
  51. 2026-06-04 13:10 UTCEPSS rescore
  52. 2026-06-04 13:10 UTCEPSS rescore
  53. 2026-06-02 20:11 UTCEPSS rescore
  54. 2026-06-02 20:11 UTCEPSS rescore
  55. 2026-06-01 13:49 UTCEPSS rescore
  56. 2026-06-01 13:49 UTCEPSS rescore
  57. 2026-05-31 22:28 UTCEPSS rescore
  58. 2026-05-31 00:14 UTCEPSS rescore
  59. 2026-05-31 00:14 UTCEPSS rescore
  60. 2026-05-29 13:41 UTCEPSS rescore
  61. 2026-05-28 13:42 UTCEPSS rescore
  62. 2026-05-28 13:42 UTCEPSS rescore
  63. 2026-05-28 06:51 UTCEG score recompute
  64. 2026-05-28 06:51 UTCVendor advisory
  65. 2026-05-28 06:50 UTCGHSA enrichment
  66. 2026-05-27 13:38 UTCEPSS rescore
  67. 2026-05-27 13:38 UTCEPSS rescore
  68. 2026-05-26 17:01 UTCOSV refresh
  69. 2026-05-26 13:42 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2017-7818?
CVE-2017-7818 is a critical vulnerability published on June 11, 2018. A use-after-free vulnerability can occur when manipulating arrays of Accessible Rich Internet Applications (ARIA) elements within containers through the DOM. This results in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
When was CVE-2017-7818 disclosed?
CVE-2017-7818 was first published in the National Vulnerability Database 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-2017-7818 actively exploited?
CVE-2017-7818 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-7818?
CVE-2017-7818 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-7818?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-7818, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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