Vulnerability-Lookup

CVE-2026-54632 (GCVE-0-2026-54632)

Vulnerability from cvelistv5 – Published: 2026-09-14 19:58 – Updated: 2026-09-15 14:43

Title

SIPSorcery: Malformed UDP packet on the RTP/ICE socket can remotely terminate a media session (DoS)

Summary

SIPSorcery is a WebRTC, SIP, and VoIP library for C# and .NET. Prior to 10.0.9, RTPChannel.OnRTPPacketReceived and the STUNAttribute.ParseMessageAttributes, STUNXORAddressAttribute, and STUNAddressAttribute parsing path index untrusted bytes without sufficient length checks, while UdpReceiver.EndReceiveFrom closes the channel when those operations raise a non-socket exception. A remote party can send a single short RTP packet or malformed zero-to-seven-byte STUN address attribute to the shared RTP/ICE socket, including during ICE connectivity checks before DTLS or STUN MESSAGE-INTEGRITY verification, and terminate the active RTP or WebRTC media session. The attacker must reach or learn the advertised ephemeral RTP/ICE port, but no authentication or user interaction is required, and the impact is limited to availability. This issue is fixed in version 10.0.9.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 14:43 UTC

CWE

CWE-20 - Improper Input Validation
CWE-755 - Improper Handling of Exceptional Conditions

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/sipsorcery-org/sipsorcery/secu…	x_refsource_CONFIRM
https://github.com/sipsorcery-org/sipsorcery/pull/1677	x_refsource_MISC
https://github.com/sipsorcery-org/sipsorcery/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
sipsorcery-org	sipsorcery	Affected: < 10.0.9	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-54632

Vulnerability from fkie_nvd - Published: 2026-09-14 20:16 - Updated: 2026-09-15 15:17

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/sipsorcery-org/sipsorcery/commit/bdb76cbc0c7216e3126f743fb78e8525af56cea2
	security-advisories@github.com	https://github.com/sipsorcery-org/sipsorcery/pull/1677
	security-advisories@github.com	https://github.com/sipsorcery-org/sipsorcery/security/advisories/GHSA-28gm-jrmw-xx93

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "sipsorcery",
          "vendor": "sipsorcery-org",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 10.0.9"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SIPSorcery is a WebRTC, SIP, and VoIP library for C# and .NET. Prior to 10.0.9, RTPChannel.OnRTPPacketReceived and the STUNAttribute.ParseMessageAttributes, STUNXORAddressAttribute, and STUNAddressAttribute parsing path index untrusted bytes without sufficient length checks, while UdpReceiver.EndReceiveFrom closes the channel when those operations raise a non-socket exception. A remote party can send a single short RTP packet or malformed zero-to-seven-byte STUN address attribute to the shared RTP/ICE socket, including during ICE connectivity checks before DTLS or STUN MESSAGE-INTEGRITY verification, and terminate the active RTP or WebRTC media session. The attacker must reach or learn the advertised ephemeral RTP/ICE port, but no authentication or user interaction is required, and the impact is limited to availability. This issue is fixed in version 10.0.9."
    }
  ],
  "id": "CVE-2026-54632",
  "lastModified": "2026-09-15T15:17:18.310",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
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          "confidentialityImpact": "NONE",
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}

GHSA-28GM-JRMW-XX93

Vulnerability from github – Published: 2026-07-28 17:01 – Updated: 2026-07-28 17:01

Summary

SIPSorcery: Malformed UDP packet on the RTP/ICE socket can remotely terminate a media session (DoS)

Details

Impact

A single malformed inbound UDP packet on the RTP/ICE socket can remotely terminate an active RTP or WebRTC media session. The packet receive handler indexes packet (and STUN attribute) bytes without sufficient length checks and throws, and the UDP receive loop converted any such exception into a channel Close rather than dropping the packet. One small, unauthenticated packet therefore ends the media session.

This is reachable during ICE connectivity checks — before the DTLS handshake and before any STUN MESSAGE-INTEGRITY verification. Because the RTP/ICE port is shared/advertised in the ICE candidates, a peer or on-path attacker can reach it (exposure is lower for a blind off-path attacker that must first learn the ephemeral port). Impact is availability only — no loss of confidentiality or integrity.

Affected versions

NuGet package SIPSorcery <= 10.0.8.

Patches

Fixed in 10.0.9.

Root cause

Two issues combine:

Unchecked indexing of untrusted bytes.
RTPChannel.OnRTPPacketReceived read packet[1] after only checking the packet was non-empty, so a 1-byte packet threw IndexOutOfRangeException.
STUNAttribute.ParseMessageAttributes passed a null/short value to the typed attribute parsers, and STUNXORAddressAttribute (and the non-XOR STUNAddressAttribute) then read attributeValue[1], AsSpan(2) and AsSpan(4) with no length check. A STUN message carrying an XOR-MAPPED-ADDRESS, XOR-PEER-ADDRESS or XOR-RELAYED-ADDRESS attribute of length 0–7 threw (NullReferenceException for length 0, IndexOutOfRangeException/ArgumentOutOfRangeException for 1–7).
The UDP receive loop closed the channel on any exception. The catch-all in UdpReceiver.EndReceiveFrom called Close(), tearing down the channel, instead of dropping the offending packet and continuing. This was systemic: any unhandled exception anywhere in the packet pipeline (STUN, RTP, RTCP, DTLS demux, SRTP, TURN) became a channel teardown.

Fix

UdpReceiver.EndReceiveFrom: a non-socket exception now logs and drops the single packet and re-arms the receive loop (matching the existing SIPUDPChannel behaviour), instead of closing the channel. Genuine socket failures continue to be handled separately.
RTPChannel.OnRTPPacketReceived: requires a minimum packet length (RTPHeader.MIN_HEADER_LEN) before indexing the discriminator bytes.
STUN parsing: ParseMessageAttributes validates each attribute value length and skips malformed/truncated attributes; the XOR/address attribute constructors validate length defensively; ParseSTUNMessage no longer dereferences a null attribute list.

Regression tests were added covering the 1-byte packet (channel stays open and remains usable), short/zero-length XOR address attributes (0–7 bytes), and truncated STUN messages.

Workarounds

None within the library short of upgrading. Restricting the RTP/ICE port to known peers at the network layer reduces exposure but does not eliminate it, since a negotiating peer can still trigger the condition.

Credit

Responsibly reported by Lokhesh Ujhoodha.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 10.0.8"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "SIPSorcery"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "10.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54632"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-755"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-28T17:01:19Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA single malformed inbound UDP packet on the RTP/ICE socket can remotely terminate an active RTP or WebRTC media session. The packet receive handler indexes packet (and STUN attribute) bytes without sufficient length checks and throws, and the UDP receive loop converted any such exception into a channel `Close` rather than dropping the packet. One small, unauthenticated packet therefore ends the media session.\n\nThis is reachable during ICE connectivity checks \u2014 before the DTLS handshake and before any STUN `MESSAGE-INTEGRITY` verification. Because the RTP/ICE port is shared/advertised in the ICE candidates, a peer or on-path attacker can reach it (exposure is lower for a blind off-path attacker that must first learn the ephemeral port). Impact is availability only \u2014 no loss of confidentiality or integrity.\n\n### Affected versions\n\nNuGet package `SIPSorcery` `\u003c= 10.0.8`.\n\n### Patches\n\nFixed in `10.0.9`.\n\n### Root cause\n\nTwo issues combine:\n\n1. **Unchecked indexing of untrusted bytes.**\n   - `RTPChannel.OnRTPPacketReceived` read `packet[1]` after only checking the packet was non-empty, so a 1-byte packet threw `IndexOutOfRangeException`.\n   - `STUNAttribute.ParseMessageAttributes` passed a `null`/short value to the typed attribute parsers, and `STUNXORAddressAttribute` (and the non-XOR `STUNAddressAttribute`) then read `attributeValue[1]`, `AsSpan(2)` and `AsSpan(4)` with no length check. A STUN message carrying an `XOR-MAPPED-ADDRESS`, `XOR-PEER-ADDRESS` or `XOR-RELAYED-ADDRESS` attribute of length 0\u20137 threw (`NullReferenceException` for length 0, `IndexOutOfRangeException`/`ArgumentOutOfRangeException` for 1\u20137).\n\n2. **The UDP receive loop closed the channel on any exception.** The catch-all in `UdpReceiver.EndReceiveFrom` called `Close()`, tearing down the channel, instead of dropping the offending packet and continuing. This was systemic: any unhandled exception anywhere in the packet pipeline (STUN, RTP, RTCP, DTLS demux, SRTP, TURN) became a channel teardown.\n\n### Fix\n\n- `UdpReceiver.EndReceiveFrom`: a non-socket exception now logs and drops the single packet and re-arms the receive loop (matching the existing `SIPUDPChannel` behaviour), instead of closing the channel. Genuine socket failures continue to be handled separately.\n- `RTPChannel.OnRTPPacketReceived`: requires a minimum packet length (`RTPHeader.MIN_HEADER_LEN`) before indexing the discriminator bytes.\n- STUN parsing: `ParseMessageAttributes` validates each attribute value length and skips malformed/truncated attributes; the XOR/address attribute constructors validate length defensively; `ParseSTUNMessage` no longer dereferences a null attribute list.\n\nRegression tests were added covering the 1-byte packet (channel stays open and remains usable), short/zero-length XOR address attributes (0\u20137 bytes), and truncated STUN messages.\n\n### Workarounds\n\nNone within the library short of upgrading. Restricting the RTP/ICE port to known peers at the network layer reduces exposure but does not eliminate it, since a negotiating peer can still trigger the condition.\n\n### Credit\n\nResponsibly reported by Lokhesh Ujhoodha.",
  "id": "GHSA-28gm-jrmw-xx93",
  "modified": "2026-07-28T17:01:19Z",
  "published": "2026-07-28T17:01:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sipsorcery-org/sipsorcery/security/advisories/GHSA-28gm-jrmw-xx93"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sipsorcery-org/sipsorcery/pull/1677"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sipsorcery-org/sipsorcery/commit/bdb76cbc0c7216e3126f743fb78e8525af56cea2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sipsorcery-org/sipsorcery"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SIPSorcery: Malformed UDP packet on the RTP/ICE socket can remotely terminate a media session (DoS)"
}

Sightings

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Action not permitted

CVE-2026-54632 (GCVE-0-2026-54632)

FKIE_CVE-2026-54632

GHSA-28GM-JRMW-XX93

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