CVE-2022-4291

CRITICALNVD 7.710.0
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2022-12-08. NVD baseline CVSS 7.7; sources differ by 2.3.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2022-51647 (ENISA EUVD) · GHSA-m5gg-2gxj-3qqx (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.7Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

The aswjsflt.dll library from Avast Antivirus windows contained a potentially exploitable heap corruption vulnerability that could enable an attacker to bypass the sandbox of the application it was loaded into, if applicable. This issue was fixed in version 18.0.1478 of the Script Shield Component.

CVSS v3
7.7
EG Score
10.0CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 8, 2022

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Oct 13, 2026
Fix named in the CVE record.
Web pageMentions a patch (unverified)

Gen™ Security Advisories | Gen™ | Gen™

https://support.norton.com/sp/static/external/tools/security-advisories.html

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 59× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 262 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 162 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 17:56 UTCEchelonGraph re-scored
  2. 2026-11-12 17:56 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-11-12 16:30 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-11-11 17:28 UTCEchelonGraph re-scored
  5. 2026-11-11 17:28 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-11-11 16:33 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  7. 2026-11-10 16:56 UTCEchelonGraph re-scored
  8. 2026-11-10 16:56 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-11-10 16:36 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  10. 2026-11-09 16:30 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  11. 2026-11-09 16:29 UTCEchelonGraph re-scored
  12. 2026-11-09 16:29 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  13. 2026-11-08 16:34 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  14. 2026-11-08 16:01 UTCEchelonGraph re-scored
  15. 2026-11-08 16:01 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  16. 2026-11-07 16:34 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  17. 2026-11-07 15:33 UTCEchelonGraph re-scored
  18. 2026-11-07 15:33 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  19. 2026-11-06 16:31 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  20. 2026-11-06 15:06 UTCEchelonGraph re-scored
  21. 2026-11-06 15:06 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  22. 2026-11-05 16:32 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  23. 2026-11-05 14:38 UTCEchelonGraph re-scored
  24. 2026-11-05 14:38 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  25. 2026-11-04 16:30 UTCEPSS rescoreEPSS 0.4% · 39th percentile
Show 75 more
  1. 2026-11-04 14:10 UTCEchelonGraph re-scored
  2. 2026-11-04 14:10 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-11-03 16:40 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  4. 2026-11-03 13:40 UTCEchelonGraph re-scored
  5. 2026-11-03 13:40 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-11-02 16:39 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  7. 2026-11-02 12:56 UTCEchelonGraph re-scored
  8. 2026-11-02 12:55 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-11-01 16:30 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  10. 2026-11-01 12:27 UTCEchelonGraph re-scored
  11. 2026-11-01 12:27 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  12. 2026-10-31 16:29 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  13. 2026-10-31 11:59 UTCEchelonGraph re-scored
  14. 2026-10-31 11:59 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  15. 2026-10-30 16:31 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  16. 2026-10-30 11:31 UTCEchelonGraph re-scored
  17. 2026-10-30 11:31 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  18. 2026-10-29 16:30 UTCEPSS rescoreEPSS 0.4% · 39th percentile
  19. 2026-10-29 11:04 UTCEchelonGraph re-scored
  20. 2026-10-29 11:03 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  21. 2026-10-28 16:28 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  22. 2026-10-28 10:26 UTCEchelonGraph re-scored
  23. 2026-10-28 10:26 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  24. 2026-10-27 16:28 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  25. 2026-10-27 09:06 UTCEchelonGraph re-scored
  26. 2026-10-27 09:06 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  27. 2026-10-26 16:28 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  28. 2026-10-26 07:38 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  29. 2026-10-25 17:59 UTCEchelonGraph re-scored
  30. 2026-10-25 16:29 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  31. 2026-10-25 07:11 UTCEchelonGraph re-scored
  32. 2026-10-25 07:11 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  33. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  34. 2026-10-24 06:43 UTCEchelonGraph re-scored
  35. 2026-10-24 06:43 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  36. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  37. 2026-10-23 06:13 UTCEchelonGraph re-scored
  38. 2026-10-23 06:13 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  39. 2026-10-22 16:30 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  40. 2026-10-22 05:44 UTCEchelonGraph re-scored
  41. 2026-10-22 05:44 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  42. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  43. 2026-10-21 05:15 UTCEchelonGraph re-scored
  44. 2026-10-21 05:15 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  45. 2026-10-20 16:29 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  46. 2026-10-20 04:47 UTCEchelonGraph re-scored
  47. 2026-10-20 04:47 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  48. 2026-10-19 16:28 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  49. 2026-10-19 04:18 UTCEchelonGraph re-scored
  50. 2026-10-19 04:18 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  51. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  52. 2026-10-18 03:50 UTCEchelonGraph re-scored
  53. 2026-10-18 03:49 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  54. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  55. 2026-10-17 03:20 UTCEchelonGraph re-scored
  56. 2026-10-17 03:19 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  57. 2026-10-16 16:35 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  58. 2026-10-16 02:50 UTCEchelonGraph re-scored
  59. 2026-10-16 02:50 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  60. 2026-10-15 16:28 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  61. 2026-10-14 22:53 UTCEchelonGraph re-scored
  62. 2026-10-14 22:53 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  63. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  64. 2026-10-13 18:32 UTCEchelonGraph re-scored
  65. 2026-10-13 18:32 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  66. 2026-10-13 16:29 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  67. 2026-10-12 18:02 UTCEchelonGraph re-scored
  68. 2026-10-12 18:01 UTCGHSA enrichmentGHSA-m5gg-2gxj-3qqx · GitHub severity CRITICAL · GitHub CVSS 10.0
  69. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  70. 2026-10-11 22:09 UTCEchelonGraph re-scored
  71. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  72. 2026-10-10 19:57 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  73. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  74. 2026-10-08 17:05 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  75. 2026-10-07 23:45 UTCEPSS rescoreEPSS 0.4% · 37th percentile

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Frequently asked(5)

What is CVE-2022-4291?
CVE-2022-4291 is a critical-severity vulnerability; its CVE record was published on December 8, 2022. The aswjsflt.dll library from Avast Antivirus windows contained a potentially exploitable heap corruption vulnerability that could enable an attacker to bypass the sandbox of the application it was loaded into, if applicable. This issue was fixed in version 18.0.1478 of the Script Shield Component.
When was CVE-2022-4291 made public?
CVE-2022-4291 was made public on December 7, 2022: that is the date its CVE record's CNA, NLOK, gives for when the vulnerability was made public. The CVE record itself was published on December 8, 2022. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2022-4291 actively exploited?
CVE-2022-4291 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-4291?
CVE-2022-4291 has a CVSS v3 base score of 7.7 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 10.0 (CRITICAL).
How do I remediate CVE-2022-4291?
The CVE record for CVE-2022-4291 names the fix: "This issue was fixed in version 18.0.1478 of the Script Shield Component."

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