CVE-2022-4291: avast script_shield
CVSS: 10.0v3.1CriticalModified
Published 07-12-2022Last modified 14-04-2025
Vulnerability summary
CVE-2022-4291 is a critical (CVSS 10.0) vulnerability in avast script_shield. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.7% of scored vulnerabilities.
CVSS score
10.0/10
010
Critical · v3.1 (NVD)EPSS score
0.45%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 07-12-2022PublishedVulnerability first disclosed.
- 14-04-2025Last modifiedVulnerability information updated.
Description
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 metrics
2 scores · 2 sources · 1 versionCritical 10.0Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HSources2 sources · 7.7–10.0
- CVE.orgCNA7.7HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:LDiffers
EPSS trend
Probability
0.45%
Chance of exploitation in the next 30 days
Percentile
38%
Versus all other CVEs
30-day change
+0.02 pp
From 0.43% on 20-09-2026
20-09-202620-10-2026
EPSS score0.45%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Avast1 product
- script_shield≤ 18.0.1473.0
Nortonlifelock1 product
- avast antivirus≤ 18.0.1473.0
2 vendors · 2 products