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CWE-119 (内存缓冲区边界内操作的限制不恰当) — Vulnerability Class 1064

1064 vulnerabilities classified as CWE-119 (内存缓冲区边界内操作的限制不恰当). AI Chinese analysis included.

CWE-119 represents a critical memory safety weakness where software performs read or write operations beyond the intended boundaries of a memory buffer. This flaw typically arises from insufficient validation of input lengths or loop counters, allowing attackers to manipulate program execution flow. By crafting malicious inputs that exceed buffer limits, adversaries can overwrite adjacent memory, corrupt data structures, or inject executable code, often leading to remote code execution or system crashes. Developers mitigate this risk by implementing rigorous bounds checking before any memory access, utilizing safe string handling functions that enforce length limits, and adopting modern programming languages with automatic memory management. Additionally, employing static analysis tools and fuzzing techniques during development helps identify out-of-bounds accesses early, ensuring that all buffer operations remain strictly within allocated memory regions to prevent exploitation.

MITRE CWE Description
The 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.
Common Consequences (3)
Integrity, Confidentiality, AvailabilityExecute Unauthorized Code or Commands, Modify Memory
If the memory accessible by the attacker can be effectively controlled, it may be possible to execute arbitrary code, as with a standard buffer overflow. If the attacker can overwrite a pointer's worth of memory (usually 32 or 64 bits), they can alter the intended control flow by redirecting a funct…
Availability, ConfidentialityRead Memory, DoS: Crash, Exit, or Restart, DoS: Resource Consumption (CPU), DoS: Resource Consumption (Memory)
Out of bounds memory access will very likely result in the corruption of relevant memory, and perhaps instructions, possibly leading to a crash. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
ConfidentialityRead Memory
In the case of an out-of-bounds read, the attacker may have access to sensitive information. If the sensitive information contains system details, such as the current buffer's position in memory, this knowledge can be used to craft further attacks, possibly with more severe consequences.
Mitigations (5)
RequirementsUse a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. Be wary that a lan…
Architecture and DesignUse a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Examples include the Safe C String Library (SafeStr) by Messier and Viega [REF-57], and the Strsafe.h library from Microsoft [REF-56]. These libraries provide safer versions of overflow-prone string-handling functions.
Operation, Build and CompilationUse automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses…
Effectiveness: Defense in Depth
ImplementationConsider adhering to the following rules when allocating and managing an application's memory: Double check that the buffer is as large as specified. When using functions that accept a number of bytes to copy, such as strncpy(), be aware that if the destination buffer size is equal to the source buffer size, it may not NULL-terminate the string. Check buffer boundaries if accessing the buffer in a…
Operation, Build and CompilationRun or compile the software using features or extensions that randomly arrange the positions of a program's executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code. Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported…
Effectiveness: Defense in Depth
Examples (2)
This example takes an IP address from a user, verifies that it is well formed and then looks up the hostname and copies it into a buffer.
void host_lookup(char *user_supplied_addr){ struct hostent *hp; in_addr_t *addr; char hostname[64]; in_addr_t inet_addr(const char *cp); /*routine that ensures user_supplied_addr is in the right format for conversion */ validate_addr_form(user_supplied_addr); addr = inet_addr(user_supplied_addr); hp = gethostbyaddr( addr, sizeof(struct in_addr), AF_INET); strcpy(hostname, hp->h_name); }
Bad · C
This example applies an encoding procedure to an input string and stores it into a buffer.
char * copy_input(char *user_supplied_string){ int i, dst_index; char *dst_buf = (char*)malloc(4*sizeof(char) * MAX_SIZE); if ( MAX_SIZE <= strlen(user_supplied_string) ){ die("user string too long, die evil hacker!"); } dst_index = 0; for ( i = 0; i < strlen(user_supplied_string); i++ ){ if( '&' == user_supplied_string[i] ){ dst_buf[dst_index++] = '&'; dst_buf[dst_index++] = 'a'; dst_buf[dst_index++] = 'm'; dst_buf[dst_index++] = 'p'; dst_buf[dst_index++] = ';'; } else if ('<' == user_supplied_string[i] ){ /* encode to &lt; */ } else dst_buf[dst_index++] = user_supplied_string[i]; } return ds
Bad · C
CVE IDTitleCVSSSeverityPublished
CVE-2019-1929 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-08-07
CVE-2019-1926 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-08-07
CVE-2019-1927 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-08-07
CVE-2019-1924 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-08-07
CVE-2019-1925 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-08-07
CVE-2019-1913 Cisco Small Business 220 Series Smart Switches Remote Code Execution Vulnerabilities — Cisco Small Business 220 Series Smart Plus Switches 9.8 -2019-08-07
CVE-2019-1901 Cisco Nexus 9000 Series ACI Mode Switch Software Link Layer Discovery Protocol Buffer Overflow Vulnerability — Cisco NX-OS System Software 8.8 -2019-07-31
CVE-2018-7838 Schneider Electric Modicon M580 CPU - BMEP582040和Ethernet Module BMENOC0301 缓冲区错误漏洞 — Modicon M580 CPU - BMEP582040 all versions before V2.90 and Modicon Ethernet Module BMENOC0301 all versions before V2.16 7.5 -2019-07-15
CVE-2019-6824 Schneider Electric ProClima 缓冲区错误漏洞 — ProClima all versions prior to version 8.0.0 9.8 -2019-07-15
CVE-2019-1892 Cisco Small Business Series Switches Memory Corruption Vulnerability — Cisco Small Business 300 Series Managed Switches 7.5 -2019-07-06
CVE-2019-1630 Cisco Integrated Management Controller Denial of Service Vulnerability — Cisco Unified Computing System (Management Software) 5.5 -2019-06-20
CVE-2019-6571 Siemens LOGO!8 缓冲区错误漏洞 — SIEMENS LOGO!8 7.5 -2019-06-12
CVE-2018-7851 多款Schneider Electric产品缓冲区错误漏洞 — Modicon M580 with firmware prior to V2.50 Modicon M340 with firmware prior to V3.01 BMxCRA312xx with firmware prior to V2.40 All firmware versions of Modicon Premium and 140CRA312xxx 6.5 -2019-05-22
CVE-2019-1768 Cisco NX-OS Software Buffer Overflow and Command Injection Vulnerability — Cisco NX-OS Software 6.7 -2019-05-16
CVE-2019-1772 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerability — Cisco WebEx WRF Player 7.8 -2019-05-15
CVE-2019-1773 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-05-15
CVE-2019-1771 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerability — Cisco WebEx WRF Player 7.8 -2019-05-15
CVE-2019-1767 Cisco NX-OS Software Buffer Overflow and Command Injection Vulnerability — Cisco NX-OS Software 6.7 -2019-05-15
CVE-2019-3561 Facebook HHVM 缓冲区错误漏洞 — HHVM 9.8 -2019-04-29
CVE-2019-1663 Cisco RV110W, RV130W, and RV215W Routers Management Interface Remote Command Execution Vulnerability — RV110W Wireless-N VPN Firewall 9.8 -2019-02-28
CVE-2019-3812 QEMU 缓冲区错误漏洞 — qemu 5.5 -2019-02-19
CVE-2019-6541 WECON Technologies LeviStudioU 缓冲区错误漏洞 — WECON LeviStudioU 7.8 -2019-02-13
CVE-2019-1651 Cisco SD-WAN Solution Buffer Overflow Vulnerability — Cisco SD-WAN Solution 8.8 -2019-01-24
CVE-2019-1637 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-01-23
CVE-2019-1638 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-01-23
CVE-2019-1639 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-01-23
CVE-2019-1640 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-01-23
CVE-2019-1641 Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities — Cisco WebEx WRF Player 7.8 -2019-01-23
CVE-2018-17905 Omron CX-Supervisor 缓冲区错误漏洞 — CX-Supervisor 7.1 -2018-11-05
CVE-2018-17907 Omron CX-Supervisor 缓冲区错误漏洞 — CX-Supervisor 3.3 -2018-11-05

Vulnerabilities classified as CWE-119 (内存缓冲区边界内操作的限制不恰当) represent 1064 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.