CVE-2026-20248 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the TCP DNS response handler to unexpectedly restart, causing the...

EUVD-2026-81143

A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the TCP DNS response handler to unexpectedly restart, causing the...

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the TCP DNS response handler to unexpectedly restart, causing the...

PT-2026-93965

Name of the Vulnerable Software and Affected Versions Cisco Secure Firewall Adaptive Security Appliance ASA Software affected versions not specified Cisco Secure Firewall Threat Defense FTD Software affected versions not specified Description A logic error in the DNS over TCP implementation occur...

CVE-2026-20248: Signed to Unsigned Conversion Error

A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance ASA Software and Cisco Secure Firewall Threat Defense FTD Software could allow an unauthenticated, remote attacker to cause the TCP DNS response handler to unexpectedly restart, causing the...

Fedora 44 : maradns (2026-7726bdbcf1)

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-7726bdbcf1 advisory. Update to 3.5.0037, fixing DNS-over-TCP bug rhbz2488786 Tenable has extracted the preceding description block directly from the Fedora security advisory. Not...

CVE-2026-32946

Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. In versions 2.15.1 and below, the Harden-Runner that allows bypass of the egress-policy: block network restriction using DNS queries over TCP. Egress policies are enforced on GitHub runners by filtering...

CVE-2026-32946

Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. In versions 2.15.1 and below, the Harden-Runner that allows bypass of the egress-policy: block network restriction using DNS queries over TCP. Egress policies are enforced on GitHub runners by filtering...

CVE-2026-32946 Egress Policy Bypass via DNS over TCP in Harden-Runner (Community Tier)

Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. In versions 2.15.1 and below, the Harden-Runner that allows bypass of the egress-policy: block network restriction using DNS queries over TCP. Egress policies are enforced on GitHub runners by filtering...

Egress Policy Bypass via DNS over TCP in Harden-Runner (Community Tier)

Summary A vulnerability exists in the Community Tier of Harden-Runner that allows bypassing the egress-policy: block network restriction using DNS queries over TCP. Harden-Runner enforces egress policies on GitHub runners by filtering outbound connections at the network layer. When egress-policy:...

CVE-2025-61430

Improper handling of DNS over TCP in Simple DNS Plus v9 allows a remote attacker with querying access to the DNS server to cause the server to return request payloads from other clients. This happens when the TCP length prefix is malformed len differs from actual packet len, and due to a...

CVE-2025-61430

Improper handling of DNS over TCP in Simple DNS Plus v9 allows a remote attacker with querying access to the DNS server to cause the server to return request payloads from other clients. This happens when the TCP length prefix is malformed len differs from actual packet len, and due to a...

CVE-2025-61430: Reliance on Reverse DNS Resolution for a Security-Critical Action

Improper handling of DNS over TCP in Simple DNS Plus v9 allows a remote attacker with querying access to the DNS server to cause the server to return request payloads from other clients. This happens when the TCP length prefix is malformed len differs from actual packet len, and due to a...

EUVD-2013-5319

Malware in sbrugna...

EUVD-2013-5320

Malware in sbrugna...

CVE-2013-5479

The DNS-over-TCP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is used, allows remote attackers to cause a denial of service device reload via a crafted IPv4 DNS TCP stream, aka Bug ID CSCtn53730...

Bullfrog's DNS over TCP bypasses domain filtering

Summary Using tcp breaks blocking and allows DNS exfiltration. PoC name: test on: push: branches: - "" jobs: testBullFrog: runs-on: ubuntu-22.04 steps: - name: Use google dns run: | sudo resolvectl dns eth0 1.1.1.1 resolvectl status - name: Set up bullfrog to block everything uses:...

CVE-2025-47775

The CVE-2025-47775 refers to Bullfrog, a GitHub Action that blocks unauthorized outbound traffic in workflows. The issue: before version 0.8.4, Bullfrog’s TCP handling could bypass the intended block, enabling DNS data exfiltration and a sandbox bypass. Affected version range includes all release...

glibc: Stack read overflow in getaddrinfo in no-aaaa mode

A flaw was found in glibc. When the getaddrinfo function is called with the AFUNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data...

AZL-34732 CVE-2023-4527 affecting package glibc for versions less than 2.38-11

A flaw was found in glibc. When the getaddrinfo function is called with the AFUNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data...