Gpg4win
Monthly
Stack-based buffer overflow in GnuPG's tpm2daemon (versions before 2.5.17) allows a local attacker to corrupt the daemon's stack by sending a crafted PKDECRYPT command targeting TPM-backed RSA or ECC keys, potentially achieving arbitrary code execution in the daemon's context. The flaw affects GnuPG and the bundled Gpg4win distribution and has been patched by upstream and major Linux vendors (Red Hat, SUSE). Publicly available exploit code exists, though the EPSS score is negligible (0.01%) and it is not listed in CISA KEV (no public exploit identified as actively exploited in the wild).
Remote code execution and denial of service in GnuPG before 2.5.17 stem from a stack-based buffer overflow in gpg-agent when it processes a crafted CMS (S/MIME) EnvelopedData message containing an oversized wrapped session key during PKDECRYPT --kem=CMS handling. Any user or service decrypting attacker-supplied S/MIME mail with a vulnerable build can be crashed, and the memory corruption may be escalated to arbitrary code execution in the gpg-agent process that custodies private keys. Publicly available exploit code exists, but the issue is not in CISA KEV and EPSS is low (0.20%, 41st percentile), indicating no confirmed widespread exploitation yet.
In GnuPG before 2.5.17, a long signature packet length causes parse_signature to return success with sig->data[] set to a NULL value, leading to a denial of service (application crash). [CVSS 3.7 LOW]
GnuPG 2.2.21 and 2.2.22 (and Gpg4win 3.1.12) has an array overflow, leading to a crash or possibly unspecified other impact, when a victim imports an attacker's OpenPGP key, and this key has AEAD. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. Public exploit code available.
Stack-based buffer overflow in GnuPG's tpm2daemon (versions before 2.5.17) allows a local attacker to corrupt the daemon's stack by sending a crafted PKDECRYPT command targeting TPM-backed RSA or ECC keys, potentially achieving arbitrary code execution in the daemon's context. The flaw affects GnuPG and the bundled Gpg4win distribution and has been patched by upstream and major Linux vendors (Red Hat, SUSE). Publicly available exploit code exists, though the EPSS score is negligible (0.01%) and it is not listed in CISA KEV (no public exploit identified as actively exploited in the wild).
Remote code execution and denial of service in GnuPG before 2.5.17 stem from a stack-based buffer overflow in gpg-agent when it processes a crafted CMS (S/MIME) EnvelopedData message containing an oversized wrapped session key during PKDECRYPT --kem=CMS handling. Any user or service decrypting attacker-supplied S/MIME mail with a vulnerable build can be crashed, and the memory corruption may be escalated to arbitrary code execution in the gpg-agent process that custodies private keys. Publicly available exploit code exists, but the issue is not in CISA KEV and EPSS is low (0.20%, 41st percentile), indicating no confirmed widespread exploitation yet.
In GnuPG before 2.5.17, a long signature packet length causes parse_signature to return success with sig->data[] set to a NULL value, leading to a denial of service (application crash). [CVSS 3.7 LOW]
GnuPG 2.2.21 and 2.2.22 (and Gpg4win 3.1.12) has an array overflow, leading to a crash or possibly unspecified other impact, when a victim imports an attacker's OpenPGP key, and this key has AEAD. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. Public exploit code available.