CVE-2021-37706— Potential integer underflow upon receiving STUN message in PJSIP
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I. Basic Information for CVE-2021-37706
Vulnerability Information
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Vulnerability Title
Potential integer underflow upon receiving STUN message in PJSIP
Source: NVD (National Vulnerability Database)
Vulnerability Description
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数下溢(超界折返)
Source: NVD (National Vulnerability Database)
Vulnerability Title
PJSIP 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PJSIP是一个免费和开源的多媒体通信库，用C语言编写，实现基于标准的协议，如SIP, SDP, RTP, STUN, TURN，和ICE。 PJSIP 存在数字错误漏洞，该漏洞源于传入的 STUN 消息包含 ERROR-CODE 属性，则在执行减法运算之前不会检查标头长度，这可能会导致整数下溢情况。 此问题会影响所有使用 STUN 的用户。 位于受害者网络中的恶意行为者可能会伪造并发送特制的 UDP (STUN) 消息，该消息可以在受害者的机器上远程执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-37706
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- https://www.debian.org/security/2022/dsa-5285vendor-advisory
- https://security.gentoo.org/glsa/202210-37vendor-advisory
- http://seclists.org/fulldisclosure/2022/Mar/0mailing-list
- https://nvd.nist.gov/vuln/detail/CVE-2021-37706
IV. Related Vulnerabilities
Same product: pjproject
- CVE-2026-42225
GnuTLS backend silently skips certificate chain verification - CVE-2026-41416
PJSIP: Asymmetric ptime integer overflow in Media Stream - CVE-2026-41415
PJSIP: SIP Multipart CID URI Length Underflow - CVE-2026-40892
PJSIP: Stack buffer overflow in pjsip_auth_create_digest2() - CVE-2026-40614
PJSIP: Heap buffer overflow in Opus codec decoding
Same vendor: pjsip
- CVE-2026-42225
GnuTLS backend silently skips certificate chain verification - CVE-2026-41416
PJSIP: Asymmetric ptime integer overflow in Media Stream - CVE-2026-41415
PJSIP: SIP Multipart CID URI Length Underflow - CVE-2026-40892
PJSIP: Stack buffer overflow in pjsip_auth_create_digest2() - CVE-2026-40614
PJSIP: Heap buffer overflow in Opus codec decoding
Same weakness: CWE-191
- CVE-2026-7736
osrg GoBGP mrt.go parseRibEntry integer underflow - CVE-2026-33845
Gnutls: gnutls: denial of service via dtls zero-length fragm - CVE-2026-7424
Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Pl - CVE-2026-7423
Integer Underflow in ICMP Echo Reply Processing in FreeRTOS- - CVE-2026-6914
MD5 checksum creation may cause availability loss
V. Comments for CVE-2021-37706
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