Improper Validation of Syntactic Correctness of Input
CWE-1286
The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax.
We track 44 vulnerabilities of this type. 100% are rated high or critical, and the average CVSS score is 7.8.
Latest Improper Validation of Syntactic Correctness of Input vulnerabilities
- 7.5 High severity
hickory-dns: Improper Validation of Syntactic Correctness of Input
Hickory-dns from 0.20.1 before 0.26.2 contains a denial of service vulnerability in the hickory-proto SVCB and HTTPS record presentation format parser, which panics on malformed alpn values. Attackers can supply untrusted zone files with unbalanced quotes, con
- 8.7 High severity
Fireware OS: Uncaught Exception
A NULL pointer dereference vulnerability in WatchGuard Fireware OS’s management interface allows a remote, unauthenticated attacker with network access to the management interface to crash the management service by sending a specially crafted login request. Re
- 8.1 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device. If an SRX device configured for AutoDisc
- 8.7 High severity
Zenius EMS 8.0: Authentication Bypass Using an Alternate Path or Channel
Authentication bypass using an alternate path or channel and Improper validation of syntactic correctness of input vulnerability in Brainzcompany Zenius EMS 8.0 allows Remote Code Inclusion. This issue affects Zenius EMS 8.0: through OAM (Build 109).
- 8.2 High severity
traefik: Inconsistent Interpretation of HTTP Requests
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path san
- 7.5 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in the SIP plugin of Juniper Networks Junos OS on MX Series with SPC3 and SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).If the SIP ALG is e
- 7.5 High severity
netty: Missing Release of Memory after Effective Lifetime
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, the HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a synta
- 8.6 High severity
fedify: Server-Side Request Forgery
Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the I
- 7.5 High severity
EOS: Improper Validation of Syntactic Correctness of Input
On affected platforms running Arista EOS with IPsec configured, a specially crafted packet can cause the dataplane to stop processing all IPsec traffic. The control plane may detect this condition, and attempt to reset the IPsec processing pipeline. After rese
- 7.5 High severity
Red Hat build of Keycloak 26.2: Improper Validation of Syntactic Correctness of Input
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial o
- 7.1 High severity
M-Files Server: Improper Validation of Syntactic Correctness of Input
Denial-of-service condition in M-Files Server versions before 26.5.16015.0, before 26.2 LTS, and before 25.8 LTS SR3 allows an authenticated user to cause the MFserver process to crash
- 9.1 Critical severity
Netty is an asynchronous, event-driven network application framework.
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface:
- 8.3 High severity
Cortex Code CLI: Improper Validation of Syntactic Correctness of Input
Improper validation of bash commands in Snowflake Cortex Code CLI versions prior to 1.0.25 allowed subsequent commands to execute outside the sandbox. An attacker could exploit this by embedding specially crafted commands in untrusted content, such as a malici
- 7.5 High severity
Net::CIDR::Lite: Improper Validation of Syntactic Correctness of Input
Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass. _pack_ipv6() does not check that uncompressed IPv6 addresses (without ::) have exactly 8 hex groups. Inputs like "abcd", "1:2:3", or "1:2:3:4:5:6:7
- 7.5 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in the IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (D
- 7.5 High severity
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system.
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication.
- 7.5 High severity
nats-server: Integer Overflow or Wraparound
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. Th
- 7.2 High severity
2N Access Commander: Improper Validation of Syntactic Correctness of Input
Improper validation of API end-point in 2N Access Commander version 3.4.2 and prior allows attacker to bypass password policy for backup file encryption. This vulnerability can only be exploited after authenticating with administrator privileges.
- 8.8 High severity
FacturaScripts is open-source enterprise resource planning and accounting software.
FacturaScripts is open-source enterprise resource planning and accounting software. Prior to version 2025.81, FacturaScripts contains a critical SQL injection vulnerability in the REST API that allows authenticated API users to execute arbitrary SQL queries th
- 7.5 High severity
BIND 9: Reachable Assertion
Malformed BRID/HHIT records can cause `named` to terminate unexpectedly. This issue affects BIND 9 versions 9.18.40 through 9.18.43, 9.20.13 through 9.20.17, 9.21.12 through 9.21.16, 9.18.40-S1 through 9.18.43-S1, and 9.20.13-S1 through 9.20.17-S1.
- 7.5 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in the Web-Filtering module of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an SRX device configured for
- 7.5 High severity
nodemailer: Improper Validation of Syntactic Correctness of Input
A vulnerability was identified in the email parsing library due to improper handling of specially formatted recipient email addresses. An attacker can exploit this flaw by crafting a recipient address that embeds an external address within quotes. This causes
- 8.8 High severity
modulo 6 devices modu680-AS: Improper Validation of Syntactic Correctness of Input
A low privileged remote attacker can corrupt the webserver users storage on the device by setting a sequence of unsupported characters which leads to deletion of all previously configured users and the creation of the default Administrator with a known default
- 7.5 High severity
NetX Duo: Out-of-bounds Read
In NextX Duo before 6.4.4, in the HTTP client module, the network support code for Eclipse Foundation ThreadX, the parsing of HTTP header fields was missing bounds verification. A crafted server response could cause undefined behavior.
- 7.5 High severity
Amazon.IonDotnet: Improper Validation of Syntactic Correctness of Input
An infinite loop issue in Amazon.IonDotnet library versions <v1.3.2 may allow a threat actor to cause a denial of service through a specially crafted text input. To mitigate this issue, users should upgrade to version v1.3.2. As of August 20, 2025, this librar
- 7.5 High severity
github.com/nyaruka/phonenumbers: Improper Validation of Syntactic Correctness of Input
Versions of the package github.com/nyaruka/phonenumbers before 1.2.2 are vulnerable to Improper Validation of Syntactic Correctness of Input in the phonenumbers.Parse() function. An attacker can cause a panic by providing crafted input causing a "runtime error
- 7.5 High severity
HL-L8260CDN: Improper Validation of Syntactic Correctness of Input
An unauthenticated attacker who can connect to the Web Services feature (HTTP TCP port 80) can issue a WS-Scan SOAP request containing an unexpected JobToken value which will crash the target device. The device will reboot, after which the attacker can reissue
- 7.5 High severity
HL-L8260CDN: Improper Validation of Syntactic Correctness of Input
An unauthenticated attacker who can connect to TCP port 9100 can issue a Printer Job Language (PJL) command that will crash the target device. The device will reboot, after which the attacker can reissue the command to repeatedly crash the device. A malformed
- 7.5 High severity
Acronis Cyber Protect Cloud Agent: Improper Validation of Syntactic Correctness of Input
Denial of service due to improper handling of malformed input. The following products are affected: Acronis Cyber Protect Cloud Agent (Linux, macOS, Windows) before build 40077, Acronis Cyber Protect 17 (Linux, macOS, Windows) before build 41186.
- 7.5 High severity
ctrlX OS - Device Admin: Improper Validation of Syntactic Correctness of Input
A vulnerability in the “Proxy” functionality of the web application of ctrlX OS allows a remote authenticated (lowprivileged) attacker to manipulate the “/etc/environment” file via a crafted HTTP request.
- 7.5 High severity
Routinator: Improper Validation of Syntactic Correctness of Input
The initial code parsing the manifest did not check the content of the file names yet later code assumed that it was checked and panicked when encountering illegal characters, resulting in a crash of Routinator.
- 9.8 Critical severity
SPIP: Improper Neutralization of Directives in Dynamically Evaluated Code
The porte_plume plugin used by SPIP before 4.30-alpha2, 4.2.13, and 4.1.16 is vulnerable to an arbitrary code execution vulnerability. A remote and unauthenticated attacker can execute arbitrary PHP as the SPIP user by sending a crafted HTTP request.
- 7.5 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with MPC10/11 or LC9600, MX304, and Junos OS Evolved on ACX Series and PTX Series allows an unauthenticated,
- 7.3 High severity
https://github.com/google/nftables: Improper Validation of Syntactic Correctness of Input
In https://github.com/google/nftables IP addresses were encoded in the wrong byte order, resulting in an nftables configuration which does not work as intended (might block or not block the desired addresses). This issue affects: https://pkg.go.dev/github.com/
- 7.8 High severity
aida64_engineer: Improper Validation of Syntactic Correctness of Input
An issue in FinalWire AIRDA Extreme, AIDA64 Engineer, AIDA64 Business, AIDA64 Network Audit through 7.00.6742 allows a local attacker to escalate privileges via the DeviceIoControl call associated with MmMapIoSpace, IoAllocateMdl, MmBuildMdlForNonPagedPool, or
- 7.5 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS). If a BGP update i
- 7.5 High severity
PAN-OS: Improper Validation of Syntactic Correctness of Input
A vulnerability in Palo Alto Networks PAN-OS software enables a remote attacker to reboot PAN-OS firewalls when receiving Windows New Technology LAN Manager (NTLM) packets from Windows servers. Repeated attacks eventually cause the firewall to enter maintenanc
- 7.5 High severity
Guardian: Improper Validation of Syntactic Correctness of Input
A Denial of Service (Dos) vulnerability in Nozomi Networks Guardian, caused by improper input validation in certain fields used in the Radius parsing functionality of our IDS, allows an unauthenticated attacker sending specially crafted malformed network packe
- 7.5 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause Denial of Service (DoS). On all Junos OS MX Series and SRX Series p
- 7.5 High severity
Junos OS: Improper Validation of Syntactic Correctness of Input
An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS). If an attacker sends high rate of spe