Buffer overflow in Siemens Simatic Pcs
CVE-2021-31893
A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3), SIMATIC PDM (All versions < V9.2), SIMATIC STEP 7 V5.X (All versions < V5.6 SP2 HF3), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 HF2). The affected software contains a buffer overflow vulnerability while handling certain files that could allow a local attacker to trigger a denial-of-service condition or potentially lead to remote code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Siemens Simatic Pcs
- Siemens Simatic Pcs 7 V8.2 And Earlier — versions All versions
- Siemens Simatic Pcs 7 V9.0 — versions All versions < V9.0 SP3
- Siemens Simatic Pcs Firmware — versions 9.0
- Siemens Simatic Pdm — versions All versions < V9.2
- Siemens Simatic Pdm
- Siemens Simatic Pdm Firmware
- Siemens Simatic Step 7
- Siemens Simatic Step 7 Firmware
- Siemens Simatic Step 7 V5.x — versions All versions < V5.6 SP2 HF3
Weakness classification (CWE)
References
- cert-portal.siemens.com/productcert/pdf/ssa-641963.pdf (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-31893?
- CVE-2021-31893 is a high-severity vulnerability in Siemens Simatic Pcs, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-07-13.
- How severe is CVE-2021-31893?
- High severity. CVSS v3 base score is 7.8 out of 10.