The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations prior to the targeted buffer.
Volume of CVEs assigned to CWE-127 and their average CVSS base score over time.
Top CVEs that have been assigned this CWE. A single CVE can have multiple CWE assignments, though many have just one.
8 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2026-5928HIGH Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the G | Apr 20, 2026 | 7.5 | 29 | NO | NO |
CVE-2020-5360HIGH Dell BSAFE Micro Edition Suite, versions prior to 4.5, are vulnerable to a Buffer Under-Read Vulnerability. An unauthenticated remote attacker could potentially exploit this vulner | Dec 16, 2020 | 7.5 | 25 | NO | NO |
CVE-2025-20359MEDIUM Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the disclosure of possible sensiti | Oct 15, 2025 | 6.5 | 24 | NO | NO |
CVE-2020-1918HIGH In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. This issue a | Mar 10, 2021 | 7.5 | 23 | NO | NO |
CVE-2024-10395HIGH No proper validation of the length of user input in http_server_get_content_type_from_extension. | Feb 3, 2025 | 7.5 | 22 | NO | NO |
OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, the Java TLS ioctl probe reads user-controlled ioctl p | Jun 2, 2026 | 3.8 | 21 | NO | NO |
CVE-2025-32050MEDIUM A flaw was found in libsoup. The libsoup append_param_quoted() function may contain an overflow bug resulting in a buffer under-read. | Apr 3, 2025 | 5.9 | 20 | NO | NO |
CVE-2024-25629MEDIUM c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files such as `/etc/resolv.conf`, `/etc/nsswitch.conf`, the `HOSTALIAS | Feb 23, 2024 | 5.5 | 18 | NO | NO |
Exploit activity across CVEs assigned to this CWE, including CVEs that carry other CWE assignments.
Social posts that mention CVE IDs assigned to this CWE. This is assigned-CVE activity, not mentions of the CWE label itself.
Media articles that mention CVE IDs assigned to this CWE. This is assigned-CVE coverage, not mentions of the CWE label itself.