CVE-2016-0999

published 2016-03-12

CVE-2016-0999: Use-after-free vulnerability in Adobe Flash Player before 18.0.0.333 and 19.x through 21.x before 21.0.0.182 on Windows and OS X and before 11.2.202.577 on…

Priority P2 70 high 8.8 CVSS 3.1

AV N AC L PR N UI R S U C H I H A H

EXPLOIT

Use-after-free vulnerability in Adobe Flash Player before 18.0.0.333 and 19.x through 21.x before 21.0.0.182 on Windows and OS X and before 11.2.202.577 on Linux, Adobe AIR before 21.0.0.176, Adobe AIR SDK before 21.0.0.176, and Adobe AIR SDK & Compiler before 21.0.0.176 allows attackers to execute arbitrary code via unspecified vectors, a different vulnerability than CVE-2016-0987, CVE-2016-0988, CVE-2016-0990, CVE-2016-0991, CVE-2016-0994, CVE-2016-0995, CVE-2016-0996, CVE-2016-0997, CVE-2016-0998, and CVE-2016-1000.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
adobe	air	<= 20.0.0.233	—
adobe	air_desktop_runtime	<= 20.0.0.260	—
adobe	air_sdk	<= 20.0.0.260	—
adobe	air_sdk_compiler	<= 20.0.0.260	—
adobe	flash_player	<= 20.0.0.306	—
adobe	flash_player	<= 11.2.202.569	—
adobe	flash_player_desktop_runtime	<= 20.2.2.306	—
samsung	x14j_firmware	—	—

Detection & IOCs extracted from sources · hover to see the quote

url https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39611.zip↗

url https://bugs.chromium.org/p/project-zero/issues/detail?id=717↗

filename crasher2.swf↗

• → Look for ActionScript calls to AsBroadcaster.initialize() followed immediately by ab.broadcastMessage() with no arguments — this triggers the uninitialized stack parameter access (alloca(0) path). ↗
• → Detect SWF files loaded with a 'num' query parameter in the range 0–31, particularly sequential loads of the same SWF with different num values (e.g., num=15 then num=4), which is characteristic of the PoC stack-shifting technique. ↗
• → Crash/exploit involves conversion of an uninitialized stack value containing a UTF string pattern 'fffff...' — memory forensics or crash dumps showing this pattern in Flash stack frames may indicate exploitation attempts. ↗

• · The PoC is described as 'finicky' and crash behavior varies by browser and stack state; the num parameter (0–31) must be tuned per target environment, meaning exploitation is not deterministic. ↗
• · CVE-2016-0999 is one of multiple use-after-free vulnerabilities patched together; the NVD source document references CVE-2016-0990, not CVE-2016-0999 directly — confirm correct CVE mapping before operationalizing detections. ↗

CVSS provenance

nvd v3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd v2.0 9.3 CRITICAL AV:N/AC:M/Au:N/C:C/I:C/A:C

osv 8.8 HIGH

vendor_redhat 8.8 HIGH

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CWE-416