CVE-2021-1493

CVE-2021-1493 targets Cisco ASA/FTD Web Services Buffer Overflow. The issue stems from insufficient boundary checks in the web services interface, allowing an authenticated remote attacker to send a crafted HTTP request to trigger a buffer overflow, which could disclose data fragments or cause a ...

CVE-2026-20007

The CVE-2026-20007 issue affects Cisco Secure Firewall Threat Defense (FTD) Software with Snort 2/3 deep packet inspection. A logic error in the integration of Snort Engine rules can cause different Snort rules to be hit during deep inspection of inner and outer connections, enabling an unauthent...

CVE-2018-0230

Cisco Firepower 2100 Series appliances running FTD 6.2.1–6.2.2 are vulnerable due to improper validation of fragmented IPv4/IPv6 packets after reassembly in the internal packet-processing path, causing Snort processes to reach 100% CPU and a DoS. Exploitation requires sending malicious fragmented...

CVE-2020-3528

CVE-2020-3528 describes a DoS vulnerability in the OSPFv2 implementation of Cisco ASA and Firepower Threat Defense (FTD) software. The issue arises from incomplete input validation when processing certain OSPFv2 packets with Link-Local Signaling (LLS) data, which could allow an unauthenticated, r...

CVE-2021-1402

Cisco Firepower Threat Defense (FTD) Software is affected by a DoS vulnerability in the software-based SSL/TLS message handler used during SSL decryption. The issue arises from insufficient validation of SSL/TLS messages, allowing an unauthenticated, remote attacker to send crafted SSL/TLS traffi...

CVE-2020-3572

CVE-2020-3572 is a memory-leak DoS in the SSL/TLS session handler of Cisco ASA and Firepower Threat Defense (FTD) software. The root cause is a memory leak when closing SSL/TLS connections in a specific state; an unauthenticated, remote attacker can exhaust device memory by creating and closing m...

CVE-2020-3554

CVE-2020-3554 affects Cisco ASA and FTD TCP packet processing due to a memory exhaustion condition, allowing unauthenticated remote DoS via high-rate crafted TCP traffic. Real-world impact per sources: potential exhaustion of device resources and DoS for transit traffic. Connected advisories conf...

CVE-2023-20086

CVE-2023-20086 affects Cisco ASA and Cisco FTD software, where improper ICMPv6 message processing could let an unauthenticated, remote attacker trigger a DoS by forcing a device reload. This is a network-facing issue (CVSS v3.1: 8.6, HIGH, NO privileges required; CPU/network target), with exploit...

CVE-2018-0228

The CVE-2018-0228 issue is a vulnerability in the ingress flow creation in Cisco ASA/FTD software. The root cause is improper handling of an internal software lock that can starve other processes of CPU cycles, causing a high CPU condition and DoS when an attacker sends a steady stream of malicio...

CVE-2021-1504

CVE-2021-1504 affects Cisco ASA and Firepower Threat Defense (FTD) Software. The issue arises from improper input validation of HTTPS requests, allowing an unauthenticated, remote attacker to trigger a device reload and cause a DoS. Exploitation involves sending a crafted HTTPS request to a vulne...

CVE-2021-40117

CVE-2021-40117 affects Cisco ASA and Firepower Threat Defense (FTD) Software. The issue is in the SSL/TLS message handler where incoming packets are not properly processed, allowing an unauthenticated remote attacker to trigger a reload of the device and cause a denial-of-service (DoS). Exploitat...

CVE-2022-20748

Cisco Firepower Threat Defense (FTD) Software contains a vulnerability in the local malware analysis process caused by insufficient error handling. An unauthenticated, remote attacker can trigger a DoS by sending a crafted file, crashing the local malware analysis process. Cisco’s advisory notes ...

CVE-2024-20402

CVE-2024-20402 affects Cisco ASA (SSL VPN) and Cisco FTD (SSL VPN) where a logic error in SSL VPN memory management can be exploited by unauthenticated remote attackers to cause the device to reload, leading to a DoS. Affected components: SSL VPN handling on ASA/FTD software. Root cause: memory-m...

CVE-2020-3254

The CVE-2020-3254 issue affects Cisco ASA and Firepower Threat Defense (FTD) software, specifically the Media Gateway Control Protocol (MGCP) inspection feature. The vulnerability arises from inefficient memory management in MGCP inspection, allowing an unauthenticated, remote attacker to send cr...

CVE-2023-20070

Cisco Firepower Threat Defense (FTD) Software is affected by CVE-2023-20070 due to a TLS 1.3 memory allocation logic error that can let an unauthenticated remote attacker trigger a reload of the Snort 3 detection engine, causing DoS and dropped packets during reload. The Snort engine restarts aut...

CVE-2018-0231

The CVE-2018-0231 issue is a TLS library input-validation vulnerability in Cisco ASA/FTD software (including ASA, ASAv, FTDv, and Firepower 2100 Series) that allows an unauthenticated remote attacker to trigger a device reload, causing a DoS. The root cause is insufficient validation of user-supp...

CVE-2023-20042

CVE-2023-20042 affects Cisco ASA/FTD AnyConnect SSL VPN. The root cause is an implementation error in the SSL/TLS session handling that can prevent the release of a session handler, enabling an unauthenticated attacker to send crafted SSL/TLS traffic and exhaust the session handler pool, leading ...

CVE-2024-20412

Cisco Firepower Threat Defense (FTD) Software on Firepower 1000, 2100, 3100, and 4200 Series contains static accounts with hard-coded passwords, enabling an unauthenticated, local attacker to access the CLI with those credentials. A successful exploit could allow data access, limited troubleshoot...

CVE-2025-20182

The CVE-2025-20182 entry describes a DoS vulnerability in IKEv2 message processing affecting Cisco ASA, FTD, IOS, and IOS XE. The root cause is insufficient input validation when handling IKEv2 traffic, which could allow an unauthenticated remote attacker to force a device reload and thus a DoS c...

CVE-2020-3583

CVE-2020-3583 describes cross-site scripting vulnerabilities in Cisco ASA/FTD Web Services interface due to insufficient validation of user input. A remote, unauthenticated attacker could entice a user to click a crafted link to execute arbitrary script in the interface context or access browser-...

CVE-2021-1236

CVE-2021-1236 affects multiple Cisco products via the Snort application detection engine. The vulnerability stems from a flaw in the detection algorithm, enabling an unauthenticated, remote attacker to bypass configured policies by sending crafted packets, potentially delivering a malicious paylo...

CVE-2020-3304

CVE-2020-3304 affects Cisco ASA and Firepower Threat Defense (FTD) web interfaces. The issue stems from improper HTTP input validation, allowing an unauthenticated, remote attacker to craft an HTTP request that can trigger a reload of the affected device, causing a DoS. Impact is limited to the w...

CVE-2020-3315

CVE-2020-3315 affects multiple Cisco products via the Snort detection engine, where incorrect handling of certain HTTP responses lets unauthenticated remote attackers bypass configured file policies and deliver payloads. Public documentation in Debian/ Mageia advisories notes the vulnerability in...

CVE-2020-3581

CVE-2020-3581 covers multiple cross-site scripting (XSS) vulnerabilities in the web services interface of Cisco ASA and FTD software. The flaws arise from insufficient validation of user-supplied input in the web services interface, allowing an unauthenticated, remote attacker to persuade a user ...

CVE-2021-1445

Cisco ASA/FTD Web Services VPN DoS vulnerabilities stem from improper input validation of HTTPS requests. An unauthenticated, remote attacker can exploit this by sending a crafted HTTPS request to an affected device, potentially causing a reload and a DoS condition. Affected products include Cisc...

CVE-2019-15992

CVE-2019-15992 is a remote code execution vulnerability in the Lua interpreter used by Cisco ASA and Cisco FTD software. It arises from insufficient restrictions on Lua function calls in user-supplied scripts, which could allow an authenticated, remote attacker to trigger a heap overflow and exec...

CVE-2021-1573

Cisco CVE-2021-1573 affects the web services interface of ASA Software and FTD Software. An unauthenticated remote attacker can trigger a DoS by sending crafted HTTPS requests, due to improper input validation when parsing HTTPS requests, causing the device to reload. Affected products: Cisco ASA...

CVE-2018-15454

CVE-2018-15454 affects the SIP inspection engine in Cisco ASA Software and Cisco FTD Software. The root cause is improper handling of SIP traffic, allowing an unauthenticated, remote attacker to trigger high CPU usage or reload the device, leading to DoS. Public sources describe this as a SIP par...

CVE-2018-15383

Cisco ASA and Firepower Threat Defense (FTD) software are affected by CVE-2018-15383 due to a vulnerability in the cryptographic hardware accelerator driver. The issue arises from limited DMA memory and improper handling of resources under low-memory conditions, which an unauthenticated remote at...

CVE-2019-1981

The CVE-2019-1981 vulnerability affects Cisco Firepower Threat Defense Software (FTD), Cisco FirePOWER Services Software for ASA, and Cisco Firepower Management Center Software. It stems from insufficient normalization of text-based payloads, enabling an unauthenticated, remote attacker to bypass...

CVE-2020-3561

CVE-2020-3561 affects Cisco ASA/FTD WebVPN (Clientless SSL VPN). The issue is a result of improper input sanitization that enables unauthenticated, remote CRLF header injection when a user is lured to click a crafted link, allowing arbitrary HTTP headers to be injected and potential redirection. ...

CVE-2021-40118

CVE-2021-40118 affects Cisco ASA/FTD web services. The vulnerability arises from improper input validation when parsing HTTPS requests, allowing an unauthenticated, remote attacker to trigger a DoS condition by sending a malicious HTTPS request, potentially causing the device to reload. The issue...

CVE-2022-20924

CVE-2022-20924 affects Cisco ASA and Cisco Firepower Threat Defense (FTD) software with SNMP. Root cause is insufficient input validation in the SNMP handling, enabling an authenticated, remote attacker to trigger device reloads and a DoS condition. Affected products include Cisco ASA/FTD; exploi...

CVE-2020-3564

CVE-2020-3564 affects Cisco ASA/FTD FTP inspection engine. Root cause: ineffective flow tracking of FTP traffic allows an unauthenticated, remote attacker to bypass FTP inspection and complete FTP connections. Affected products include Cisco ASA Software and Cisco FTD Software. In practice, explo...

CVE-2023-20264

Cisco ASA/FTD SAML SSO implementation flaw allows an unauthenticated attacker to intercept a user’s SAML assertion during remote VPN authentication due to insufficient login URL validation. An attacker can entice a user to visit a site under the attacker’s control, modify the login URL, and use t...

CVE-2020-3436

The CVE-2020-3436 vulnerability affects Cisco ASA/FTD Web Services: an unauthenticated attacker can upload arbitrarily large files to specific folders, triggering a watchdog timeout and an unexpected device reload (DoS) due to inefficient handling of large file writes. Affected products are Cisco...

CVE-2021-34793

CVE-2021-34793 is a DoS vulnerability in Cisco ASA/FTD software (transparent mode) due to improper handling of certain TCP segments by the TCP Normalizer, allowing an unauthenticated remote attacker to poison MAC address tables and disrupt networks. Affected products include Cisco ASA and Cisco F...

CVE-2023-20063

Cisco Firepower Threat Defense (FTD) and Cisco Firepower Management Center (FMC) inter-device communication contains a code-injection vulnerability due to insufficient input validation. An authenticated, local attacker who gains admin privileges on an associated device can use expert mode to subm...

CVE-2024-20355

CVE-2024-20355 affects Cisco ASA/FTD SAML SSO. The issue stems from improper separation of authorization domains, allowing an authenticated remote user to reuse a SAML token to access a tunnel group they are not authorized for, enabling a remote VPN session to secured networks behind the device. ...

CVE-2019-1714

CVE-2019-1714 affects Cisco ASA and Cisco Firepower Threat Defense (FTD) software, where the SAML 2.0 SSO implementation has improper credential handling for NTLM or basic authentication. An unauthenticated, remote attacker could open a VPN session after another user has authenticated via SAML SS...

CVE-2020-3533

The CVE-2020-3533 issue affects Cisco Firepower Threat Defense (FTD) Software, targeting the SNMP input packet processor. Root cause: insufficient memory management protections under heavy SNMP polling loads. Attack scenario: unauthenticated, remote attacker sends a high rate of SNMP requests to ...

CVE-2023-20244

CVE-2023-20244 affects Cisco Firepower Threat Defense (FTD) on Cisco Firepower 2100 Series, with vulnerable internal packet processing in the inspection engine. The issue allows an unauthenticated, remote attacker to trigger a DoS by sending crafted packets, potentially depleting all 9,472-byte b...

CVE-2019-1978

The CVE-2019-1978 issue affects Cisco Firepower Threat Defense Software, Cisco FirePOWER Services Software for ASA, and Cisco Firepower Management Center Software. It stems from improper stream reassembly in the stream reassembly component, allowing an unauthenticated, remote attacker to bypass f...

CVE-2020-3167

CVE-2020-3167 covers a CLI command injection vulnerability in Cisco FXOS Software and Cisco UCS Manager Software. The issue stems from insufficient input validation in CLI commands, allowing an authenticated, local attacker to inject crafted arguments and execute arbitrary OS commands with the pr...

CVE-2022-20934

CVE-2022-20934 affects Cisco Firepower Threat Defense (FTD) and Cisco FXOS Software. The issue is a command-injection vulnerability in the CLI caused by insufficient input validation, allowing an authenticated, local attacker with Administrator privileges to inject OS commands and gain root acces...

CVE-2018-15399

This CVE (CVE-2018-15399) affects Cisco ASA/FTD TCP Syslog: a missing boundary check in the internal function allows an unauthenticated, remote attacker in MITM position to modify syslog TCP segments, exhausting 1550-byte buffers and causing DoS. Impacted features include AnyConnect SSL VPN, clie...

CVE-2020-3373

Cisco ASA software and Firepower Threat Defense (FTD) are affected by CVE-2020-3373: an IP fragment-handling memory leak caused by improper error handling during IP fragment reassembly. An unauthenticated remote attacker could send crafted fragmented IPv4/IPv6 traffic to exhaust memory, degrade t...

CVE-2022-20730

Cisco Firepower Threat Defense (FTD) is affected by CVE-2022-20730, a Security Intelligence DNS feed bypass vulnerability caused by incorrect feed update processing. An unauthenticated, remote attacker could bypass DNS feed protections and send blocked traffic through an affected device, potentia...

CVE-2023-20031

The CVE-2023-20031 issue affects Cisco Firepower Threat Defense (FTD) with Snort 3, where a logic error in SSL/TLS certificate handling during SSL handshake under load can be exploited by a high rate of connection requests to cause the Snort 3 engine to reload. Consequences documented include pot...

CVE-2019-12678

The CVE-2019-12678 issue affects Cisco ASA/FTD SIP inspection: an unauthenticated remote attacker can send malicious SIP packets to trigger an integer underflow in the SIP parsing module, causing the device to read unmapped memory and crash. Root cause: improper SIP message parsing in the SIP ins...