diff --git a/src/netaddress.h b/src/netaddress.h
--- a/src/netaddress.h
+++ b/src/netaddress.h
@@ -30,10 +30,8 @@
 /** IP address (IPv6, or IPv4 using mapped IPv6 range (::FFFF:0:0/96)) */
 class CNetAddr {
 protected:
-    // in network byte order
-    uint8_t ip[16];
-    // for scoped/link-local ipv6 addresses
-    uint32_t scopeId;
+    uint8_t ip[16];      // in network byte order
+    uint32_t scopeId{0}; // for scoped/link-local ipv6 addresses
 
 public:
     CNetAddr();
@@ -54,39 +52,25 @@
      */
     bool SetInternal(const std::string &name);
 
-    // for Tor addresses
-    bool SetSpecial(const std::string &strName);
-    // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
-    bool IsIPv4() const;
-    // IPv6 address (not mapped IPv4, not Tor)
-    bool IsIPv6() const;
-    // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
-    bool IsRFC1918() const;
-    // IPv4 inter-network communications (192.18.0.0/15)
-    bool IsRFC2544() const;
-    // IPv4 ISP-level NAT (100.64.0.0/10)
-    bool IsRFC6598() const;
-    // IPv4 documentation addresses (192.0.2.0/24, 198.51.100.0/24,
-    // 203.0.113.0/24)
-    bool IsRFC5737() const;
-    // IPv6 documentation address (2001:0DB8::/32)
-    bool IsRFC3849() const;
-    // IPv4 autoconfig (169.254.0.0/16)
-    bool IsRFC3927() const;
-    // IPv6 6to4 tunnelling (2002::/16)
-    bool IsRFC3964() const;
-    // IPv6 unique local (FC00::/7)
-    bool IsRFC4193() const;
-    // IPv6 Teredo tunnelling (2001::/32)
-    bool IsRFC4380() const;
-    // IPv6 ORCHID (2001:10::/28)
-    bool IsRFC4843() const;
-    // IPv6 autoconfig (FE80::/64)
-    bool IsRFC4862() const;
-    // IPv6 well-known prefix (64:FF9B::/96)
-    bool IsRFC6052() const;
-    // IPv6 IPv4-translated address (::FFFF:0:0:0/96)
-    bool IsRFC6145() const;
+    bool SetSpecial(const std::string &strName); // for Tor addresses
+    bool IsBindAny() const;                      // INADDR_ANY equivalent
+    bool IsIPv4() const;    // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
+    bool IsIPv6() const;    // IPv6 address (not mapped IPv4, not Tor)
+    bool IsRFC1918() const; // IPv4 private networks (10.0.0.0/8,
+                            // 192.168.0.0/16, 172.16.0.0/12)
+    bool IsRFC2544() const; // IPv4 inter-network communications (192.18.0.0/15)
+    bool IsRFC6598() const; // IPv4 ISP-level NAT (100.64.0.0/10)
+    bool IsRFC5737() const; // IPv4 documentation addresses (192.0.2.0/24,
+                            // 198.51.100.0/24, 203.0.113.0/24)
+    bool IsRFC3849() const; // IPv6 documentation address (2001:0DB8::/32)
+    bool IsRFC3927() const; // IPv4 autoconfig (169.254.0.0/16)
+    bool IsRFC3964() const; // IPv6 6to4 tunnelling (2002::/16)
+    bool IsRFC4193() const; // IPv6 unique local (FC00::/7)
+    bool IsRFC4380() const; // IPv6 Teredo tunnelling (2001::/32)
+    bool IsRFC4843() const; // IPv6 ORCHID (2001:10::/28)
+    bool IsRFC4862() const; // IPv6 autoconfig (FE80::/64)
+    bool IsRFC6052() const; // IPv6 well-known prefix (64:FF9B::/96)
+    bool IsRFC6145() const; // IPv6 IPv4-translated address (::FFFF:0:0:0/96)
     bool IsTor() const;
     bool IsLocal() const;
     bool IsRoutable() const;
diff --git a/src/netaddress.cpp b/src/netaddress.cpp
--- a/src/netaddress.cpp
+++ b/src/netaddress.cpp
@@ -20,7 +20,6 @@
 
 CNetAddr::CNetAddr() {
     memset(ip, 0, sizeof(ip));
-    scopeId = 0;
 }
 
 void CNetAddr::SetIP(const CNetAddr &ipIn) {
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -296,4 +296,45 @@
     BOOST_CHECK_EQUAL(IsLocal(addr), false);
 }
 
+// prior to PR #14728, this test triggers an undefined behavior
+BOOST_AUTO_TEST_CASE(ipv4_peer_with_ipv6_addrMe_test) {
+    // set up local addresses; all that's necessary to reproduce the bug is
+    // that a normal IPv4 address is among the entries, but if this address is
+    // !IsRoutable the undefined behavior is easier to trigger deterministically
+    {
+        LOCK(cs_mapLocalHost);
+        in_addr ipv4AddrLocal;
+        ipv4AddrLocal.s_addr = 0x0100007f;
+        CNetAddr addr = CNetAddr(ipv4AddrLocal);
+        LocalServiceInfo lsi;
+        lsi.nScore = 23;
+        lsi.nPort = 42;
+        mapLocalHost[addr] = lsi;
+    }
+
+    // create a peer with an IPv4 address
+    in_addr ipv4AddrPeer;
+    ipv4AddrPeer.s_addr = 0xa0b0c001;
+    CAddress addr = CAddress(CService(ipv4AddrPeer, 7777), NODE_NETWORK);
+    std::unique_ptr<CNode> pnode =
+        std::make_unique<CNode>(0, NODE_NETWORK, 0, INVALID_SOCKET, addr, 0, 0,
+                                CAddress{}, std::string{}, false);
+    pnode->fSuccessfullyConnected.store(true);
+
+    // the peer claims to be reaching us via IPv6
+    in6_addr ipv6AddrLocal;
+    memset(ipv6AddrLocal.s6_addr, 0, 16);
+    ipv6AddrLocal.s6_addr[0] = 0xcc;
+    CAddress addrLocal = CAddress(CService(ipv6AddrLocal, 7777), NODE_NETWORK);
+    pnode->SetAddrLocal(addrLocal);
+
+    // before patch, this causes undefined behavior detectable with clang's
+    // -fsanitize=memory
+    AdvertiseLocal(&*pnode);
+
+    // suppress no-checks-run warning; if this test fails, it's by triggering a
+    // sanitizer
+    BOOST_CHECK(1);
+}
+
 BOOST_AUTO_TEST_SUITE_END()