CVE-2021-3999A flaw was found in glibc.
Updated under an hour ago ()
Does this affect you?
It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 12 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-193
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
gnu glibc gnu:glibc | before 2.31 | NVD |
debian debian_linux debian:debian_linux | 10.0; 11.0; 10.0 | NVD |
netapp e-series_performance_analyzer netapp:e-series_performance_analyzer | all versions | NVD |
netapp nfs_plug-in netapp:nfs_plug-in | all versions | NVD |
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility | all versions | NVD |
netapp h300s_firmware netapp:h300s_firmware | all versions | NVD |
netapp h500s_firmware netapp:h500s_firmware | all versions | NVD |
netapp h700s_firmware netapp:h700s_firmware | all versions | NVD |
netapp h410s_firmware netapp:h410s_firmware | all versions | NVD |
netapp h410c_firmware netapp:h410c_firmware | all versions | NVD |
References
- https://www.openwall.com/lists/oss-security/2022/01/24/4exploit, mailing-list, third-party-advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=28769issue-tracking, third-party-advisory
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
- https://bugzilla.redhat.com/show_bug.cgi?id=2024637issue-tracking, third-party-advisory
- https://access.redhat.com/security/cve/CVE-2021-3999third-party-advisory
- https://security-tracker.debian.org/tracker/CVE-2021-3999third-party-advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlmailing-list, third-party-advisory
- https://security.netapp.com/advisory/ntap-20221104-0001/third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-831302.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.