diff --git a/src/index.ts b/src/index.ts
index fc03f54..a4bd7a0 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -15,7 +15,7 @@ import { createSpinner } from "./output/spinner.js";
 import { buildSuggestedFixCommandPlan } from "./remediation/fix-commands.js";
 import { scanProjectForPackageUsage } from "./usage/scanner.js";
 import { getCliVersion } from "./utils/version-info.js";
-import { isLikelyBlockedAdvisoryRequestError } from "./utils/network.js";
+import { isLikelyBlockedAdvisoryRequestError, isSslCertificateError, sslCertificateErrorHint, blockedAdvisoryRequestHint } from "./utils/network.js";
 import type { SuggestedFixCommandPlan, SuggestedFixTarget } from "./remediation/fix-commands.js";
 import type { ParsedOptions } from "./types.js";
 import type { Finding, SeverityLabel } from "./types.js";
@@ -301,10 +301,14 @@ if (parsedArgs) {
   main().catch((error) => {
     const errorMessage = error instanceof Error ? error.message : String(error);
     console.error(chalk.red(`Error: ${errorMessage}`));
-    if (isLikelyBlockedAdvisoryRequestError(errorMessage)) {
-      console.error(chalk.yellow("Hint: Outbound access to the OSV API may be blocked or restricted in this environment."));
-      console.error(chalk.gray("If that is expected, build the advisory DB on a machine with OSV access, then scan here with `--offline` or `--offline-db /path/to/advisories.db`."));
-      console.error(chalk.gray("Command to build the DB on a network-allowed machine: `cve-lite advisories sync --output /path/to/advisories.db`"));
+    if (isSslCertificateError(errorMessage)) {
+      const [hint, ...rest] = sslCertificateErrorHint();
+      console.error(chalk.yellow(hint));
+      rest.forEach(line => console.error(chalk.gray(line)));
+    } else if (isLikelyBlockedAdvisoryRequestError(errorMessage)) {
+      const [hint, ...rest] = blockedAdvisoryRequestHint();
+      console.error(chalk.yellow(hint));
+      rest.forEach(line => console.error(chalk.gray(line)));
     }
     process.exit(1);
   });
@@ -358,7 +362,7 @@ async function scanProject(params: {
   const minSeverity = normalizeSeverity(params.options.minSeverity || "medium");
   const tableFindings = params.options.all
     ? sorted
-    : sorted.filter(f => severityOrder[f.severity] >= severityOrder[minSeverity]);
+    : sorted.filter(f => severityOrder[f.severity] >= severityOrder[minSeverity] || f.severity === "unknown");
   const suggestedFixCommands = buildSuggestedFixCommandPlan(sorted, params.scanInput, { offline });
 
   return {
diff --git a/src/utils/network.ts b/src/utils/network.ts
index 278ba4d..1a77c8b 100644
--- a/src/utils/network.ts
+++ b/src/utils/network.ts
@@ -1,3 +1,36 @@
+export function sslCertificateErrorHint(): string[] {
+  return [
+    "Hint: SSL certificate error — your network may be using a corporate proxy that intercepts HTTPS traffic.",
+    "Fix 1 (recommended): trust your corporate CA certificate:",
+    "  NODE_EXTRA_CA_CERTS=/path/to/corporate-ca.crt cve-lite .",
+    "Fix 2 (quick workaround, not recommended for production): disable TLS verification:",
+    "  NODE_TLS_REJECT_UNAUTHORIZED=0 cve-lite .",
+  ];
+}
+
+export function blockedAdvisoryRequestHint(): string[] {
+  return [
+    "Hint: Outbound access to the OSV API may be blocked or restricted in this environment.",
+    "If that is expected, build the advisory DB on a machine with OSV access, then scan here with `--offline` or `--offline-db /path/to/advisories.db`.",
+    "Command to build the DB on a network-allowed machine: `cve-lite advisories sync --output /path/to/advisories.db`",
+  ];
+}
+
+export function isSslCertificateError(message: string): boolean {
+  const normalized = message.toLowerCase();
+  return [
+    "self-signed certificate",
+    "self_signed_cert_in_chain",
+    "cert_untrusted",
+    "unable_to_verify_leaf_signature",
+    "depth_zero_self_signed_cert",
+    "certificate has expired",
+    "cert_has_expired",
+    "unable to verify the first certificate",
+    "certificate chain",
+  ].some(indicator => normalized.includes(indicator));
+}
+
 export function isLikelyBlockedAdvisoryRequestError(message: string): boolean {
   if (!message.includes("OSV")) {
     return false;
diff --git a/tests/network.test.ts b/tests/network.test.ts
index 4a672ac..2698419 100644
--- a/tests/network.test.ts
+++ b/tests/network.test.ts
@@ -1,4 +1,30 @@
-import { isLikelyBlockedAdvisoryRequestError } from "../src/utils/network.js";
+import { isLikelyBlockedAdvisoryRequestError, isSslCertificateError } from "../src/utils/network.js";
+
+describe("isSslCertificateError", () => {
+  it("returns true for self-signed certificate errors", () => {
+    expect(isSslCertificateError("OSV batch query failed: self-signed certificate in certificate chain")).toBe(true);
+    expect(isSslCertificateError("fetch failed: self_signed_cert_in_chain")).toBe(true);
+    expect(isSslCertificateError("SELF_SIGNED_CERT_IN_CHAIN")).toBe(true);
+  });
+
+  it("returns true for untrusted certificate errors", () => {
+    expect(isSslCertificateError("cert_untrusted")).toBe(true);
+    expect(isSslCertificateError("unable_to_verify_leaf_signature")).toBe(true);
+    expect(isSslCertificateError("depth_zero_self_signed_cert")).toBe(true);
+    expect(isSslCertificateError("unable to verify the first certificate")).toBe(true);
+  });
+
+  it("returns true for expired certificate errors", () => {
+    expect(isSslCertificateError("certificate has expired")).toBe(true);
+    expect(isSslCertificateError("cert_has_expired")).toBe(true);
+  });
+
+  it("returns false for unrelated network errors", () => {
+    expect(isSslCertificateError("ECONNREFUSED")).toBe(false);
+    expect(isSslCertificateError("fetch failed")).toBe(false);
+    expect(isSslCertificateError("403 Forbidden")).toBe(false);
+  });
+});
 
 describe("isLikelyBlockedAdvisoryRequestError", () => {
   it("returns true for OSV failures that look like blocked or restricted network access", () => {