Siemens SIMATIC S7-1500 Integer Overflow or Wraparound (CVE-2019-5435)

An integer overflow in curl's URL API results in a buffer overflow in libcurl 7.62.0 to and including 7.64.1. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc. include'compat.inc'; if...

Siemens SIMATIC S7-1500 Out-of-bounds Write (CVE-2019-5436)

A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc...

Siemens SIMATIC S7-1500 Improper Authentication (CVE-2023-27536)

An authentication bypass vulnerability exists libcurl 8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPTGSSAPIDELEGATION option. This vulnerability affects...

Siemens SIMATIC S7-1500 Improper Input Validation (CVE-2023-27538)

libcurl would reuse a previously created connection even when an SSH related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, two SSH settings were...

Siemens SIMATIC S7-1500 Exposure of Sensitive Information to an Unauthorized Actor (CVE-2020-8169)

The libcurl library versions 7.62.0 to and including 7.70.0 are vulnerable to an information disclosure vulnerability that can lead to a partial password being leaked over the network and to the DNS servers. This plugin only works with Tenable.ot. Please visit...

Siemens SIMATIC S7-1500 Improper Authentication (CVE-2023-27535)

An authentication bypass vulnerability exists in libcurl 8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain...

Siemens SIMATIC and SCALANCE Integer Overflow to Buffer Overflow (CVE-2025-0725)

When libcurl is asked to perform automatic gzip decompression of content-encoded HTTP responses with the CURLOPTACCEPTENCODING option, using zlib 1.2.0.3 or older, an attacker-controlled integer overflow would make libcurl perform a buffer overflow. This plugin only works with Tenable.ot. Please...

Siemens SIMATIC S7-1500 Double Free (CVE-2021-22945)

When sending data to an MQTT server, libcurl = 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it again. This plugin only works with Tenable.ot. Please visit...

Siemens RUGGEDCOM ROX, SIMATIC S7-1500 Improper Certificate Validation (CVE-2022-27782)

libcurl would reuse a previously created connection even when a TLS or SSHrelated option had been changed that should have prohibited reuse.libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse if one of them matches the setup. However, several TLS andSSH...

Siemens RUGGEDCOM ROX, SIMATIC S7-1500 Uncontrolled Resource Consumption (CVE-2022-27781)

libcurl provides the CURLOPTCERTINFO option to allow applications torequest details to be returned about a server's certificate chain.Due to an erroneous function, a malicious server could make libcurl built withNSS get stuck in a never-ending busy-loop when trying to retrieve thatinformation. Th...

Siemens SIMATIC and SCALANCE Multiple Releases of Same Resource or Handle (CVE-2025-0665)

libcurl would wrongly close the same eventfd file descriptor twice when taking down a connection channel after having completed a threaded name resolve. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C...

Siemens SIMATIC S7-1500 Improper Certificate Validation (CVE-2020-8286)

The libcurl library versions 7.41.0 to and including 7.73.0 are vulnerable to an improper check for certificate revocation due to insufficient verification of the OCSP response. This vulnerability could allow an attacker to pass a revoked certificate as valid. This plugin only works with...

curl: libcurl FTP path normalization flaw allows decoded %2e%2e → CWD .. and directory escape (Path Traversal, CWE-22)

ftpparseurlpath in lib/ftp.c URL-decodes FTP path segments e.g. %2e%2e and then splits the decoded path into components using an ad-hoc loop that skips empty components produced by //. The code does not perform canonical path normalization no stack-based handling of . or ... As a result, encoded...

curl: libcurl MQTT `CURLOPT_POSTFIELDSIZE_LARGE` overflow leads to immediate DoS

Summary An attacker can crash or forcefully abort any application that uses libcurl's MQTT support by setting an excessively large value for CURLOPTPOSTFIELDSIZELARGE. The MQTT publish logic lib/mqtt.c::mqttpublish trusts this value without validating it against the protocol's maximum remaining...

curl: libcurl MQTT PUBLISH length overflow (heap overflow)

Summary: Heap-based buffer overflow in libcurl’s MQTT PUBLISH assembly lib/mqtt.c::mqttpublish due to unchecked sizet arithmetic when computing the MQTT “Remaining Length”. If payloadlen + 2 + topiclen wraps sizet, libcurl allocates a too-small buffer and then memcpy’s payloadlen bytes into it,...

curl: SMTP Command Injection Vulnerability in libcurl 8.16.0 via RFC 3461 Suffix

Executive Summary libcurl version 8.16.0 contains a critical SMTP command injection vulnerability CVE-quality in the implementation of RFC 3461 Delivery Status Notification DSN parameter support. The vulnerability allows an attacker to inject arbitrary SMTP commands by including CRLF \r\n...

JLSEC-2025-23 Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when...

Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data...

JLSEC-2025-36 libcurl's ASN1 parser has this utf8asn1str() function used for parsing an ASN.1 UTF-8 string

libcurl's ASN1 parser has this utf8asn1str function used for parsing an ASN.1 UTF-8 string. Itcan detect an invalid field and return error. Unfortunately, when doing so it also invokes free on a 4 byte localstack buffer. Most modern malloc implementations detect this error and immediately abort...

JLSEC-2025-32 A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate...

A double free vulnerability exists in libcurl 8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread...

JLSEC-2025-35 This flaw allows an attacker to insert cookies at will into a running program using libcurl, if the...

This flaw allows an attacker to insert cookies at will into a running program using libcurl, if the specific series of conditions are met. libcurl performs transfers. In its API, an application creates "easy handles" that are the individual handles for single transfers. libcurl provides a functio...