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CWE-228

Improper Handling of Syntactically Invalid Structure

ClassIncompleteSimple20 CVEs
The product does not handle or incorrectly handles input that is not syntactically well-formed with respect to the associated specification.

Common consequences1

  • IntegrityAvailabilityUnexpected StateDoS: Crash, Exit, or RestartDoS: Resource Consumption (CPU)

    If an input is syntactically invalid, then processing the input could place the system in an unexpected state that could lead to a crash, consume available system resources or other unintended behaviors.

Relationships2

CVEs referencing this CWE20

CVEDescriptionSeverityEPSSFlagsModified
CVE-2018-5381

The Quagga BGP daemon (bgpd) prior to version 1.2.3 has a bug in its parsing of "Capabilities" in BGP OPEN messages, in the bgp_packet.c:bgp_capability_msg_parse function. The parser can enter an infinite loop on invalid capabilities if a Multi-Protocol capability does not have a recognized AFI/SAFI, causing a denial of service.

NONE
30%p98
2024-11-21
CVE-2021-38443

Eclipse CycloneDDS versions prior to 0.8.0 improperly handle invalid structures, which may allow an attacker to write arbitrary values in the XML parser.

CRITICAL9.8
2.09%p79
2025-04-16
CVE-2020-27847

A vulnerability exists in the SAML connector of the github.com/dexidp/dex library used to process SAML Signature Validation. This flaw allows an attacker to bypass SAML authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. This flaw affects dex versions before 2.27.0.

CRITICAL9.8
1.72%p74
2024-11-21
CVE-2021-36199

Running a vulnerability scanner against VideoEdge NVRs can cause some functionality to stop.

MEDIUM5.3
1.05%p60
2024-11-21
CVE-2026-42100

Improper Handling of Syntactically Invalid Structure in Sparx Pro Cloud Server allows Denial of Service (DoS) attack to be executed by sending an specially crafted SQL query. This causes the Pro Cloud Server service to terminate unexpectedly.  The vendor was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Only version 6.1 (build 167) and below were tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.

HIGH7.5
0.68%p48
2026-06-02
CVE-2023-39914

NLnet Labs' bcder library up to and including version 0.7.2 panics while decoding certain invalid input data rather than rejecting the data with an error. This can affect both the actual decoding stage as well as accessing content of types that utilized delayed decoding.

HIGH7.5
0.59%p44
2024-11-21
CVE-2024-21612

An Improper Handling of Syntactically Invalid Structure vulnerability in Object Flooding Protocol (OFP) service of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). On all Junos OS Evolved platforms, when specific TCP packets are received on an open OFP port, the OFP crashes leading to a restart of Routine Engine (RE). Continuous receipt of these specific TCP packets will lead to a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS Evolved * All versions earlier than 21.2R3-S7-EVO; * 21.3 versions earlier than 21.3R3-S5-EVO ; * 21.4 versions earlier than 21.4R3-S5-EVO; * 22.1 versions earlier than 22.1R3-S4-EVO; * 22.2 versions earlier than 22.2R3-S3-EVO ; * 22.3 versions earlier than 22.3R3-EVO; * 22.4 versions earlier than 22.4R2-EVO, 22.4R3-EVO.

HIGH7.5
0.53%p41
2025-06-17
CVE-2024-55594

An improper handling of syntactically invalid structure in Fortinet FortiWeb at least vesrions 7.4.0 through 7.4.6 and 7.2.0 through 7.2.10 and 7.0.0 through 7.0.10 allows attacker to execute unauthorized code or commands via HTTP/S crafted requests.

CRITICAL9.8
0.49%p38
2025-07-24
CVE-2026-34232

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the xdr_status_vector() function does not handle the isc_arg_cstring type when decoding an op_response packet, causing a server crash when one is encountered in the status vector. An unauthenticated attacker can exploit this by sending a crafted op_response packet to the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

HIGH7.5
0.47%p37
2026-04-27
CVE-2024-53828

Ericsson Packet Core Controller (PCC) versions prior to 1.38 contain a vulnerability where an attacker sending a large volume of specially crafted messages may cause service degradation.

MEDIUM5.3
0.36%p28
2026-04-10
CVE-2023-42784

An improper handling of syntactically invalid structure in Fortinet FortiWeb at least verions 7.4.0 through 7.4.6 and 7.2.0 through 7.2.10 and 7.0.0 through 7.0.10 allows attacker to execute unauthorized code or commands via HTTP/S crafted requests.

CRITICAL9.8
0.35%p27
2025-07-22
CVE-2025-0343

Swift ASN.1 can be caused to crash when parsing certain BER/DER constructions. This crash is caused by a confusion in the ASN.1 library itself which assumes that certain objects can only be provided in either constructed or primitive forms, and will trigger a preconditionFailure if that constraint isn't met. Importantly, these constraints are actually required to be true in DER, but that correctness wasn't enforced on the early node parser side so it was incorrect to rely on it later on in decoding, which is what the library did. These crashes can be triggered when parsing any DER/BER format object. There is no memory-safety issue here: the crash is a graceful one from the Swift runtime. The impact of this is that it can be used as a denial-of-service vector when parsing BER/DER data from unknown sources, e.g. when parsing TLS certificates.

HIGH7.5
0.32%p23
2026-04-15
CVE-2026-20125

A vulnerability in the HTTP Server feature of Cisco IOS Software and Cisco IOS XE Software Release 3E could allow an authenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending malformed HTTP requests to an affected device. A successful exploit could allow the attacker to cause a watchdog timer to expire and the device to reload, resulting in a DoS condition. To exploit this vulnerability, the attacker must have a valid user account.

HIGH7.7
0.28%p20
2026-03-26
CVE-2024-6382

Incorrect handling of certain string inputs may result in MongoDB Rust driver constructing unintended server commands. This may cause unexpected application behavior including data modification. This issue affects MongoDB Rust Driver 2.0 versions prior to 2.8.2

HIGH7.5
0.28%p19
2025-10-02
CVE-2024-22809

Incorrect access control in Tormach xsTECH CNC Router, PathPilot Controller v2.9.6 allows attackers to access the G code's shared folder and view sensitive information.

MEDIUM6.5
0.25%p16
2025-09-15
CVE-2024-22815

An issue in the communication protocol of Tormach xsTECH CNC Router, PathPilot Controller v2.9.6 allows attackers to cause a Denial of Service (DoS) via crafted commands.

MEDIUM5.3
0.23%p13
2025-09-15
CVE-2025-47736

dialect/mod.rs in the libsql-sqlite3-parser crate through 0.13.0 before 14f422a for Rust can crash if the input is not valid UTF-8.

LOW2.9
0.21%p11
2026-04-15
CVE-2025-2529

Applications using affected versions of Ehcache 3.x can experience degraded cache-write performance if the application using Ehcache utilizes keys sourced from (malicious) external parties in an unfiltered/unsalted way.

LOW3.7
0.19%p9
2026-01-14
CVE-2025-59174

Ericsson Packet Core Controller (PCC) versions prior to 1.39 contain a vulnerability where an attacker sending a large volume of specially crafted messages may cause service degradation.

MEDIUM6.5
0.17%p6
2026-06-08
CVE-2026-25657

Ericsson Packet Core Gateway (PCG) versions prior to 1.30 contain an Improper Handling of Syntactically Invalid Structure (CWE-228) vulnerability where an attacker continuously sending a specially crafted message can cause service degradation. The impact continues as long the attack persists but the system recovers from the crashes when the attack stops.

MEDIUM6.5
0.17%p6
2026-06-08