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 services: Not assessed

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
8.8HIGHmedium confidence
EG Risk
70
EG Risk 70/100CISA 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
Severity88% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
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
31%
EPSS %ILE
98th
KEV
Not listed

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

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 partial (CVSS below 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

March 13, 2016

Last Modified

June 17, 2026

References (50)

Patch Availability(4)

Vendor / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
icedove10.0.12-1 ... 38.6.0-1~deb8u1 (87 versions)
  • every version up to 38.7.0-1~deb7u1: fixed in 38.7.0-1~deb7u1
—
iceweasel10.0.12esr-1 ... 38.6.1esr-1~deb8u1 (179 versions)
  • every version up to 38.7.0esr-1~deb7u1: fixed in 38.7.0esr-1~deb7u1
—
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
icedove31.6.0-1 ... 38.7.0-1~deb7u1 (34 versions)
  • every version up to 38.7.0-1~deb8u1: fixed in 38.7.0-1~deb8u1
—
iceweasel31.6.0esr-1 ... 38.7.0esr-1~deb7u1 (58 versions)
  • every version up to 38.7.0esr-1~deb8u1: fixed in 38.7.0esr-1~deb8u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.0esr-1: fixed in 45.0esr-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.0esr-1: fixed in 45.0esr-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.0esr-1: fixed in 45.0esr-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 45.0esr-1: fixed in 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 4× in last 7d / 16× 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 126 total refreshes for this CVE.

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

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 product + 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 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. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 31% probability of exploitation in the next 30 days (98th percentile of EPSS-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?
A fix for CVE-2016-1960 is available: update to the fixed version the vendor names in its advisory.

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