Siemens SIMATIC S7 PLC Web Server

SUMMARY SIMATIC S7 PLCs contain multiple vulnerabilities in the web server that could allow an attacker to perform cross-site scripting attacks. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix...

PT-2026-39983

Name of the Vulnerable Software and Affected Versions SIMATIC CN 4100 versions prior to V5.0 Description SIMATIC CN 4100 is susceptible to resource exhaustion when subjected to a high volume of TCP SYN packets, a condition known as a TCP SYN flood. This allows an attacker to overwhelm system...

CVE-2021-27384

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7" & 15" incl. SIPLUS variants All versions V15.1 Update 6, SIMATIC HMI Comfort Outdoor Panels V16 7" & 15" incl. SIPLUS variants All versions V16 Update 4, SIMATIC HMI Comfort Panels V15 4" - 22" incl. SIPLUS...

Siemens SIMATIC Improper Neutralization of Input During Web Page Generation (CVE-2025-40943)

Affected devices do not properly sanitize contents of trace files. This could allow an attacker to inject code through social engineering an authorized user, who has the function right Read diagnostics, to import a specially crafted trace file. The malicious trace file is insufficiently sanitized...

Siemens SIMATIC S7-1500 Reachable Assertion (CVE-2025-38285)

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix WARN in getbpfrawtpregs syzkaller reported an issue: WARNING: CPU: 3 PID: 5971 at kernel/trace/bpftrace.c:1861 getbpfrawtpregs+0xa4/0x100 kernel/trace/bpftrace.c:1861 Modules linked in: CPU: 3 UID: 0 PID: 5971 Comm:...

Siemens SIMATIC S7-1500 Divide By Zero (CVE-2025-38312)

In the Linux kernel, the following vulnerability has been resolved: fbdev: core: fbcvt: avoid division by 0 in fbcvthperiod In fbfindmodecvt, iff mode-refresh somehow happens to be 0x80000000, cvt.frefresh will become 0 when multiplying it by 2 due to overflow. It's then passed to fbcvthperiod,...

Siemens SIMATIC S7-1500 NULL Pointer Dereference (CVE-2025-38198)

In the Linux kernel, the following vulnerability has been resolved: fbcon: Make sure modelist not set on unregistered console It looks like attempting to write to the storemodes sysfs node will run afoul of unregistered consoles: UBSAN: array-index-out-of-bounds in...

Siemens SIMATIC S7-1500 Improper Locking (CVE-2025-38058)

In the Linux kernel, the following vulnerability has been resolved: legitimizemnt: check for MNTSYNCUMOUNT should be under mountlock ... or we risk stealing final mntput from sync umount - raising mntcount after umount2 has verified that victim is not busy, but before it has set MNTSYNCUMOUNT; in...

Siemens SIMATIC S7-1500 Integer Overflow or Wraparound (CVE-2025-38222)

"In the Linux kernel, the following vulnerability has been resolved: ext4: inline: fix len overflow in ext4prepareinlinedata When running the following code on an ext4 filesystem with inlinedata feature enabled, it will lead to the bug below. fd = openfile1, ORDWR | OCREAT | OTRUNC, 0666...

Siemens SIMATIC S7-1500 Improper Input Validation (CVE-2025-38499)

In the Linux kernel, the following vulnerability has been resolved: cloneprivatemnt: make sure that caller has CAPSYSADMIN in the right userns What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. Wouldn't be able to undo may be a resu...

Siemens SIMATIC S7-1500 Improper Input Validation (CVE-2025-38451)

In the Linux kernel, the following vulnerability has been resolved: md/md-bitmap: fix GPF in bitmapgetstats The commit message of commit 6ec1f0239485 md/md-bitmap: fix stats collection for external bitmaps states: Remove the external bitmap check as the statistics should be available regardless o...

Siemens SIMATIC S7-1500 Concurrent Execution using Shared Resource with Improper Synchronization (CVE-2025-38083)

In the Linux kernel, the following vulnerability has been resolved: netsched: prio: fix a race in priotune Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 1: lock root 2: qdisctreeflushbacklog 3: unlock root | ...

Siemens SIMATIC S7-1500 Improper Input Validation (CVE-2025-38063)

In the Linux kernel, the following vulnerability has been resolved: dm: fix unconditional IO throttle caused by REQPREFLUSH When a bio with REQPREFLUSH is submitted to dm, sendemptyflush generates a flushbio with REQOPWRITE | REQPREFLUSH | REQSYNC, which causes the flushbio to be throttled by...

Siemens SIMATIC S7-1500 Concurrent Execution using Shared Resource with Improper Synchronization (CVE-2025-38393)

In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: Fix a race to wake on NFSLAYOUTDRAIN We found a few different systems hung up in writeback waiting on the same page lock, and one task waiting on the NFSLAYOUTDRAIN bit in pnfsupdatelayout, however the pnfslayouthdr's...

Siemens SIMATIC S7-1500 Improper Input Validation (CVE-2025-38430)

In the Linux kernel, the following vulnerability has been resolved: nfsd: nfsd4spomustallow must check this is a v4 compound request If the request being processed is not a v4 compound request, then examining the cstate can have undefined results. This patch adds a check that the rpc procedure...

Siemens SIMATIC S7-1500 Improper Input Validation (CVE-2025-38071)

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Check return value from memblockphysallocrange At least with CONFIGPHYSICALSTART=0x100000, if there is 4 MiB of contiguous free memory available at this point, the kernel will crash and burn because memblockphysallocrange...

Siemens SIMATIC S7-1500 NULL Pointer Dereference (CVE-2025-38364)

In the Linux kernel, the following vulnerability has been resolved: mapletree: fix MASTATEPREALLOC flag in maspreallocate Temporarily clear the preallocation flag when explicitly requesting allocations. Pre-existing allocations are already counted against the request through masnodecountgfp, but...

Siemens SIMATIC S7-1500 Use After Free (CVE-2025-38471)

In the Linux kernel, the following vulnerability has been resolved: tls: always refresh the queue when reading sock After recent changes in net-next TCP compacts skbs much more aggressively. This unearthed a bug in TLS where we may try to operate on an old skb when checking if all skbs in the que...

Siemens SIMATIC S7-1500 Sensitive Cookie Without 'HttpOnly' Flag (CVE-2025-38477)

In the Linux kernel, the following vulnerability has been resolved: net/sched: schqfq: Fix race condition on qfqaggregate A race condition can occur when 'agg' is modified in qfqchangeagg called during qfqenqueue while other threads access it concurrently. For example, qfqdumpclass may trigger a...

Siemens SIMATIC S7-1500 Double Free (CVE-2025-38079)

In the Linux kernel, the following vulnerability has been resolved: crypto: algifhash - fix double free in hashaccept If accept2 is called on socket type algifhash with MSGMORE flag set and cryptoahashimport fails, sk2 is freed. However, it is also freed in afalgrelease, leading to...