CVE-2016-1960

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
8.8EG
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: 31%CVSS: 8.8Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

A fix is available — apply it.

Integer underflow in the nsHtml5TreeBuilder class in the HTML5 string parser in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) by leveraging mishandling of end tags, as demonstrated by incorrect SVG processing, aka ZDI-CAN-3545.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
70(Track)
EG Risk 70/100SSVC: 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
Severity88% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
31%
EPSS %ILE
98%
KEV
Not listed

Published

March 13, 2016

Last Modified

June 17, 2026

References (50)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox (45.0+build2-0ubuntu0.15.10.1) @ wily2026-05-22ubuntu
ubuntuxul-ext-lightning (1:38.7.2+build1-0ubuntu0.16.04.1) @ xenial2026-05-22ubuntu
redhatthunderbird-0:38.7.0-1.el7_22016-03-16redhat
redhatfirefox-0:38.7.0-1.el7_22016-03-09redhat

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

(8 across 6 ecosystems)
Debian:7(2)
PackageVulnerable rangeFixed inDependents
icedove10.0.12-1 ... 38.6.0-1~deb8u1 (87 versions)38.7.0-1~deb7u1—
iceweasel10.0.12esr-1 ... 38.6.1esr-1~deb8u1 (179 versions)38.7.0esr-1~deb7u1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
icedove31.6.0-1 ... 38.7.0-1~deb7u1 (34 versions)38.7.0-1~deb8u1—
iceweasel31.6.0esr-1 ... 38.7.0esr-1~deb7u1 (58 versions)38.7.0esr-1~deb8u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.0esr-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.0esr-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.0esr-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—45.0esr-1—

All Vendor Advisories

(4)

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 6× in last 7d / 22× 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. 2026-08-19 16:59 UTCEPSS rescore
  2. 2026-08-18 13:43 UTCEPSS rescore
  3. 2026-08-17 13:42 UTCEPSS rescore
  4. 2026-08-16 14:51 UTCEPSS rescore
  5. 2026-08-16 02:09 UTCEPSS rescore
  6. 2026-08-15 01:25 UTCEPSS rescore
  7. 2026-08-14 13:24 UTCOSV refresh
  8. 2026-08-12 13:46 UTCEPSS rescore
  9. 2026-08-11 13:36 UTCEPSS rescore
  10. 2026-08-06 13:42 UTCEPSS rescore
  11. 2026-08-05 19:12 UTCEPSS rescore
  12. 2026-08-04 15:04 UTCEPSS rescore
  13. 2026-08-02 02:22 UTCEPSS rescore
  14. 2026-08-01 04:11 UTCEPSS rescore
  15. 2026-07-30 16:23 UTCEPSS rescore
  16. 2026-07-30 02:24 UTCOSV refresh
  17. 2026-07-30 01:26 UTCEPSS rescore
  18. 2026-07-28 15:31 UTCEPSS rescore
  19. 2026-07-26 14:50 UTCEPSS rescore
  20. 2026-07-25 14:13 UTCEPSS rescore
  21. 2026-07-23 14:14 UTCEPSS rescore
  22. 2026-07-23 01:22 UTCEG score recompute
  23. 2026-07-22 22:01 UTCEG score recompute▼ 0.20
  24. 2026-07-22 14:04 UTCEPSS rescore
  25. 2026-07-21 15:21 UTCEPSS rescore
Show 75 more
  1. 2026-07-21 15:21 UTCEPSS rescore
  2. 2026-07-20 17:03 UTCEPSS rescore
  3. 2026-07-19 02:26 UTCEPSS rescore
  4. 2026-07-19 02:26 UTCEPSS rescore
  5. 2026-07-18 10:00 UTCEPSS rescore
  6. 2026-07-18 10:00 UTCEPSS rescore
  7. 2026-07-16 16:59 UTCEPSS rescore
  8. 2026-07-16 16:59 UTCEPSS rescore
  9. 2026-07-15 16:54 UTCEPSS rescore
  10. 2026-07-15 16:54 UTCEPSS rescore
  11. 2026-07-13 22:26 UTCEPSS rescore
  12. 2026-07-12 11:37 UTCOSV refresh
  13. 2026-07-12 05:43 UTCEPSS rescore
  14. 2026-07-12 05:43 UTCEPSS rescore
  15. 2026-07-11 08:23 UTCEPSS rescore
  16. 2026-07-09 19:05 UTCEPSS rescore
  17. 2026-07-08 15:10 UTCEPSS rescore
  18. 2026-07-07 13:42 UTCEPSS rescore
  19. 2026-07-06 16:24 UTCEPSS rescore
  20. 2026-07-06 16:24 UTCEPSS rescore
  21. 2026-07-04 06:28 UTCEPSS rescore
  22. 2026-07-01 15:02 UTCEPSS rescore
  23. 2026-06-28 04:53 UTCEPSS rescore
  24. 2026-06-27 03:05 UTCEPSS rescore
  25. 2026-06-27 03:05 UTCEPSS rescore
  26. 2026-06-25 13:47 UTCEPSS rescore
  27. 2026-06-25 13:47 UTCEPSS rescore
  28. 2026-06-24 14:02 UTCEPSS rescore
  29. 2026-06-24 14:02 UTCEPSS rescore
  30. 2026-06-23 21:30 UTCEPSS rescore
  31. 2026-06-23 16:50 UTCOSV refresh
  32. 2026-06-21 01:57 UTCEPSS rescore
  33. 2026-06-21 01:57 UTCEPSS rescore
  34. 2026-06-18 17:50 UTCEPSS rescore
  35. 2026-06-17 17:50 UTCEPSS rescore
  36. 2026-06-17 17:50 UTCEPSS rescore
  37. 2026-06-16 17:50 UTCEPSS rescore
  38. 2026-06-16 17:50 UTCEPSS rescore
  39. 2026-06-15 17:45 UTCEPSS rescore
  40. 2026-06-13 22:57 UTCEPSS rescore
  41. 2026-06-13 22:57 UTCEPSS rescore
  42. 2026-06-12 23:09 UTCEPSS rescore
  43. 2026-06-12 23:09 UTCEPSS rescore
  44. 2026-06-11 13:57 UTCEPSS rescore
  45. 2026-06-10 13:18 UTCEPSS rescore
  46. 2026-06-08 14:14 UTCEPSS rescore
  47. 2026-06-07 15:22 UTCEPSS rescore
  48. 2026-06-07 15:22 UTCEPSS rescore
  49. 2026-06-06 22:29 UTCOSV refresh
  50. 2026-06-05 22:44 UTCEPSS rescore
  51. 2026-06-05 06:08 UTCEPSS rescore
  52. 2026-06-05 06:08 UTCEPSS rescore
  53. 2026-06-04 13:10 UTCEPSS rescore
  54. 2026-06-04 13:10 UTCEPSS rescore
  55. 2026-06-02 20:10 UTCEPSS rescore
  56. 2026-06-01 13:49 UTCEPSS rescore
  57. 2026-06-01 13:49 UTCEPSS rescore
  58. 2026-05-31 00:14 UTCEPSS rescore
  59. 2026-05-29 13:41 UTCEPSS rescore
  60. 2026-05-28 13:42 UTCEPSS rescore
  61. 2026-05-28 13:42 UTCEPSS rescore
  62. 2026-05-27 13:38 UTCEPSS rescore
  63. 2026-05-27 13:38 UTCEPSS rescore
  64. 2026-05-26 13:42 UTCEPSS rescore
  65. 2026-05-22 21:15 UTCEPSS rescore
  66. 2026-05-22 21:15 UTCEPSS rescore
  67. 2026-05-22 21:09 UTCEG score recompute
  68. 2026-05-22 21:09 UTCVendor advisory
  69. 2026-05-22 21:09 UTCGHSA enrichment
  70. 2026-05-21 22:36 UTCOSV refresh
  71. 2026-05-20 22:37 UTCEPSS rescore
  72. 2026-05-20 22:37 UTCEPSS rescore
  73. 2026-05-20 22:37 UTCEPSS rescore
  74. 2026-05-18 21:30 UTCEPSS rescore
  75. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-44294✓ verified
    First seen Mar 16, 2018

    Firefox 44.0.2 - ASM.JS JIT-Spray Remote Code Execution

    Open source ↗
  • Exploit-DBEDB-42484
    First seen Aug 18, 2017

    Mozilla Firefox < 45.0 - 'nsHtml5TreeBuilder' Use-After-Free (EMET 5.52 Bypass)

    Open source ↗

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2016-1960?
CVE-2016-1960 is a high vulnerability published on March 13, 2016. Integer underflow in the nsHtml5TreeBuilder class in the HTML5 string parser in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) by leveraging mishandling of end tags, as demonstrated by…
When was CVE-2016-1960 disclosed?
CVE-2016-1960 was first published in the National Vulnerability Database on March 13, 2016, 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-2016-1960 actively exploited?
CVE-2016-1960 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31% probability of exploitation in the next 30 days, which ranks it in the top 1.9% of all scored CVEs.
What is the CVSS score of CVE-2016-1960?
CVE-2016-1960 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2016-1960?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-1960, 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.

Dependency Blast Radius

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