CVE-2013-0757

HIGHCVSS v2 · 9.39.3—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 9.3 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:M/Au:N/C:C/I:C/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 60.9% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
9.3EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 61%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 61%CVSS v2: 9.3Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not prevent modifications to the prototype of an object, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges by referencing Object.prototype.__proto__ in a crafted HTML document.

CVSS v2.0 (legacy)
9.3HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
9.3HIGHlow confidence
EG Risk
72
EG Risk 72/100CISA 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
Severity93% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track or Track* at medium and Track* or 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
61%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track or Track* at medium and Track* or 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 unknown (not published for this CVE). 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

January 13, 2013

Last Modified

April 29, 2026

References (20)

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuthunderbird (17.0.2+build1-0ubuntu0.12.10.1) @ quantal2026-05-29ubuntu
ubuntufirefox (18.0+build1-0ubuntu0.12.10.3) @ quantal2026-05-29ubuntu

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.

All Vendor Advisories

(2)

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 2× in last 7d / 10× 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. 2026-09-30 14:58 UTCEPSS rescore
  2. 2026-09-29 08:35 UTCEG score recompute
  3. 2026-09-27 13:39 UTCEPSS rescore
  4. 2026-09-26 15:52 UTCEPSS rescore
  5. 2026-09-24 13:57 UTCEPSS rescore
  6. 2026-09-20 20:08 UTCEPSS rescore
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  20. 2026-08-19 16:59 UTCEPSS rescore
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  24. 2026-08-12 13:45 UTCEPSS rescore
  25. 2026-08-07 16:21 UTCEPSS rescore
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  1. 2026-08-05 19:12 UTCEPSS rescore
  2. 2026-08-04 15:04 UTCEPSS rescore
  3. 2026-08-02 02:22 UTCEPSS rescore
  4. 2026-07-30 01:26 UTCEPSS rescore
  5. 2026-07-28 15:31 UTCEPSS rescore
  6. 2026-07-26 13:47 UTCEG score recompute▲ 9.30
  7. 2026-07-25 14:12 UTCEPSS rescore
  8. 2026-07-23 01:09 UTCEG score recompute▼ 5.00
  9. 2026-07-23 00:12 UTCEG score recompute▲ 5.00
  10. 2026-07-22 21:51 UTCEG score recompute
  11. 2026-07-22 14:04 UTCEPSS rescore
  12. 2026-07-22 14:04 UTCEPSS rescore
  13. 2026-07-21 15:21 UTCEPSS rescore
  14. 2026-07-20 17:03 UTCEPSS rescore
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  16. 2026-07-19 14:27 UTCEPSS rescore
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  18. 2026-07-18 10:00 UTCEPSS rescore
  19. 2026-07-16 16:58 UTCEPSS rescore
  20. 2026-07-15 16:54 UTCEPSS rescore
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  22. 2026-07-13 22:26 UTCEPSS rescore
  23. 2026-07-13 06:08 UTCEPSS rescore
  24. 2026-07-11 08:23 UTCEPSS rescore
  25. 2026-07-09 19:05 UTCEPSS rescore
  26. 2026-07-05 02:26 UTCEPSS rescore
  27. 2026-07-01 15:02 UTCEPSS rescore
  28. 2026-06-28 04:53 UTCEPSS rescore
  29. 2026-06-28 04:53 UTCEPSS rescore
  30. 2026-06-27 03:05 UTCEPSS rescore
  31. 2026-06-25 13:46 UTCEPSS rescore
  32. 2026-06-23 21:30 UTCEPSS rescore
  33. 2026-06-22 14:22 UTCEPSS rescore
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  35. 2026-06-21 14:53 UTCEPSS rescore
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  38. 2026-06-17 17:49 UTCEPSS rescore
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  40. 2026-06-16 17:49 UTCEPSS rescore
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  42. 2026-06-15 17:44 UTCEPSS rescore
  43. 2026-06-14 23:14 UTCEPSS rescore
  44. 2026-06-13 22:57 UTCEPSS rescore
  45. 2026-06-12 23:08 UTCEPSS rescore
  46. 2026-06-11 13:56 UTCEPSS rescore
  47. 2026-06-10 13:18 UTCEPSS rescore
  48. 2026-06-08 14:14 UTCEPSS rescore
  49. 2026-06-07 15:22 UTCEPSS rescore
  50. 2026-06-05 22:44 UTCEPSS rescore
  51. 2026-06-05 22:44 UTCEPSS rescore
  52. 2026-06-05 06:08 UTCEPSS rescore
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  54. 2026-06-02 20:10 UTCEPSS rescore
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  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. 2026-05-31 00:14 UTCEPSS rescore
  60. 2026-05-29 13:41 UTCEPSS rescore
  61. 2026-05-29 13:41 UTCEPSS rescore
  62. 2026-05-29 01:22 UTCEG score recompute
  63. 2026-05-29 01:22 UTCVendor advisory
  64. 2026-05-29 01:22 UTCGHSA enrichment
  65. 2026-05-28 13:42 UTCEPSS rescore
  66. 2026-05-28 13:42 UTCEPSS rescore
  67. 2026-05-28 13:42 UTCEPSS rescore
  68. 2026-05-27 13:38 UTCEPSS rescore
  69. 2026-05-27 13:38 UTCEPSS rescore
  70. 2026-05-24 16:43 UTCEPSS rescore
  71. 2026-05-21 22:39 UTCEPSS rescore
  72. 2026-05-18 21:29 UTCEPSS rescore
  73. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-41684✓ verified
    First seen Dec 18, 2014

    GIT 1.8.5.6/1.9.5/2.0.5/2.1.4/2.2.1 & Mercurial < 3.2.3 - Multiple Vulnerabilities (Metasploit)

    Open source ↗
  • Exploit-DBEDB-41683✓ verified
    First seen Jan 8, 2013

    Mozilla Firefox < 17.0.1 - Flash Privileged Code Injection (Metasploit)

    Open source ↗
  • Metasploitexploit/multi/browser/firefox_svg_plugin✓ verified
    First seen Jan 8, 2013

    Firefox 17.0.1 Flash Privileged Code Injection

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2013-0757?
CVE-2013-0757 is a high vulnerability published on January 13, 2013. The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.2, and SeaMonkey before 2.15 does not prevent modifications to the prototype of an object, which allows remote attackers to…
When was CVE-2013-0757 disclosed?
CVE-2013-0757 was first published on January 13, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-0757 actively exploited?
CVE-2013-0757 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 61% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2013-0757?
A fix for CVE-2013-0757 is available: update to the fixed version the vendor names in its advisory.

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