CVE-2017-20228 | Flatassembler Flat Assembler 1.71.21 out-of-bounds write (Exploit 42265 / EUVD-2017-18949)

VDB-354102 · CVE-2017-20228 · EXPLOIT 42265 FLATASSEMBLER FLAT ASSEMBLER 1.71.21 OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.6 $0-$5k 1.66+ Summaryinfo A vulnerability classified as critical was found in Flatassembler Flat Assembler 1.71.21. Affected by this issue is some unknown functionality. The manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2017-20228. The attack requires a local approach. Moreover, an exploit is present. Detailsinfo A vulnerability was found in Flatassembler Flat Assembler 1.71.21. It has been classified as critical. Affected is an unknown function. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: Flat Assembler 1.71.21 contains a stack-based buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying oversized input to the application. Attackers can craft malicious assembly input exceeding 5895 bytes to overwrite the instruction pointer and execute return-oriented programming chains for shell command execution. The advisory is available at exploit-db.com. This vulnerability is traded as CVE-2017-20228 since 03/28/2026. The exploitability is told to be easy. Local access is required to approach this attack. Technical details are unknown but a public exploit is available. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the databases at Exploit-DB (42265) and EUVD (EUVD-2017-18949). Productinfo Vendor Flatassembler Name Flat Assembler Version 1.71.21 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 6.8 VulDB Meta Temp Score: 6.6 VulDB Base Score: 5.3 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.4 CNA Vector (VulnCheck): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds write CWE: CWE-787 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: No Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 EPSS Score: 🔒 EPSS Percentile: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Exploit-DB: 🔒 Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/28/2026 Advisory disclosed 03/28/2026 +0 days CVE reserved 03/28/2026 +0 days VulDB entry created 03/29/2026 +0 days VulDB entry last update Sourcesinfo Advisory: 42265 Status: Not defined CVE: CVE-2017-20228 (🔒) GCVE (CVE): GCVE-0-2017-20228 GCVE (VulDB): GCVE-100-354102 EUVD: 🔒 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/28/2026 21:57 Updated: 03/29/2026 00:36 Changes: 03/28/2026 21:57 (79), 03/29/2026 00:36 (1) Complete: 🔍 Cache ID: 99:A31:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸