Exploitable NULL pointer deref could lead to arbitrary code execution
Priority MEDIUM 47CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, Red Hat and Microsoft. Impact type from CWE-476.
Summary
Adobe Flash Player version 32.0.0.433 (and earlier) are affected by an exploitable NULL pointer dereference vulnerability that could result in a crash and arbitrary code execution. Exploitation of this issue requires an attacker to insert malicious strings in an HTTP response that is by default delivered over TLS/SSL.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.04255 91st percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisoryMicrosoft: 1 update
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Adobe | Flash Player | up to 32.0.0.387; up to 32.0.0.433; up to None | — | No fix listed | CNA |
- Flash Player VendorAdobe Affected up to 32.0.0.387; up to 32.0.0.433; up to None Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:adobe:flash_player:*:*:*:*:*:*:*:* | up to 32.0.0.433 | Vulnerable | Adobe |
| cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Apple |
| cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Linux |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:a:adobe:flash_player:*:*:*:*:*:chrome:*:* | before 32.0.0.433 | Vulnerable | Adobe |
| cpe:2.3:o:google:chrome_os:-:*:*:*:*:*:*:* | not specified by NVD | Running on | |
| cpe:2.3:a:adobe:flash_player:*:*:*:*:*:edge:*:* | before 32.0.0.387 | Vulnerable | Adobe |
| cpe:2.3:a:adobe:flash_player:*:*:*:*:*:internet_explorer_11:*:* | before 32.0.0.387 | Vulnerable | Adobe |
| cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:adobe:flash_player:*:*:*:*:*:*:*:* Versions up to 32.0.0.433 Vulnerable ·Adobe
- cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple
- cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux
- cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:a:adobe:flash_player:*:*:*:*:*:chrome:*:* Versions before 32.0.0.433 Vulnerable ·Adobe
- cpe:2.3:o:google:chrome_os:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Google
- cpe:2.3:a:adobe:flash_player:*:*:*:*:*:edge:*:* Versions before 32.0.0.387 Vulnerable ·Adobe
- cpe:2.3:a:adobe:flash_player:*:*:*:*:*:internet_explorer_11:*:* Versions before 32.0.0.387 Vulnerable ·Adobe
- cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Remediation
Red Hat 1 advisory
- RHSA-2020:4251 Released 2020-10-14 · Red Hat rating Criticalflash-plugin security update
- Red Hat Enterprise Linux Desktop Supplementary (v. 6) flash-plugin-32.0.0.445-1.el6_10
- Red Hat Enterprise Linux Server Supplementary (v. 6) flash-plugin-32.0.0.445-1.el6_10
- Red Hat Enterprise Linux Workstation Supplementary (v. 6) flash-plugin-32.0.0.445-1.el6_10
Microsoft 1 update
- October 2020 Adobe Flash Security Update
Vendor assessments
Red Hat
Red Hat rating: Critical. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux Desktop Supplementary (v. 6) | Fixed | RHSA-2020:4251 |
| Red Hat Enterprise Linux Server Supplementary (v. 6) | Fixed | RHSA-2020:4251 |
| Red Hat Enterprise Linux Workstation Supplementary (v. 6) | Fixed | RHSA-2020:4251 |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-9746
- 2026-10-03 Alias added: GHSA-h82h-rg57-cr4v
References
More Adobe Flash Player vulnerabilities
- TI-2016-03560 Unspecified vulnerability in Adobe Flash Player 21.0.0.242 and earlier allows remote… KEVCVSS 3.1CRITICAL 9.8
- TI-2016-03506 Adobe Flash Player 21.0.0.226 and earlier allows remote attackers to execute arbitrary… KEVCVSS 3.1CRITICAL 9.8
- TI-2016-00925 Adobe Flash Player 21.0.0.197 and earlier allows remote attackers to cause a denial of… KEVCVSS 3.1CRITICAL 9.8
- TI-2015-04302 Use-after-free vulnerability in the BitmapData class in the ActionScript 3 (AS3)… KEVCVSS 3.1CRITICAL 9.8
- TI-2015-04301 Use-after-free vulnerability in the DisplayObject class in the ActionScript 3 (AS3)… KEVCVSS 3.1CRITICAL 9.8
- TI-2015-04298 Use-after-free vulnerability in the ByteArray class in the ActionScript 3 (AS3)… KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2020-9746 · CVE Program
- CVE-2020-9746 · NVD
- FIRST EPSS
- GHSA-h82h-rg57-cr4v · GitHub Advisory Database · CC BY 4.0
- CVE-2020-9746 · Red Hat security data · CC BY 4.0
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