Use DeleteSecurityGroup with an AWS SDK or CLI

    /// <summary>
    /// Delete an Amazon EC2 security group.
    /// </summary>
    /// <param name="groupName">The name of the group to delete.</param>
    /// <returns>A Boolean value indicating the success of the action.</returns>
    public async Task<bool> DeleteSecurityGroup(string groupId)
    {
        try
        {
            var response =
                await _amazonEC2.DeleteSecurityGroupAsync(
                    new DeleteSecurityGroupRequest { GroupId = groupId });
            return response.HttpStatusCode == HttpStatusCode.OK;
        }
        catch (AmazonEC2Exception ec2Exception)
        {
            if (ec2Exception.ErrorCode == "InvalidGroup.NotFound")
            {
                _logger.LogError(
                    $"Security Group {groupId} does not exist and cannot be deleted. Please verify the ID and try again.");
            }

            return false;
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Couldn't delete the security group because: {ex.Message}");
            return false;
        }
    }

###############################################################################
# function ec2_delete_security_group
#
# This function deletes an Amazon Elastic Compute Cloud (Amazon EC2) security group.
#
# Parameters:
#       -i security_group_id - The ID of the security group to delete.
#
# And:
#       0 - If successful.
#       1 - If it fails.
###############################################################################
function ec2_delete_security_group() {
  local security_group_id response
  local option OPTARG # Required to use getopts command in a function.

  # bashsupport disable=BP5008
  function usage() {
    echo "function ec2_delete_security_group"
    echo "Deletes an Amazon Elastic Compute Cloud (Amazon EC2) security group."
    echo "  -i security_group_id - The ID of the security group to delete."
    echo ""
  }

  # Retrieve the calling parameters.
  while getopts "i:h" option; do
    case "${option}" in
      i) security_group_id="${OPTARG}" ;;
      h)
        usage
        return 0
        ;;
      \?)
        echo "Invalid parameter"
        usage
        return 1
        ;;
    esac
  done
  export OPTIND=1

  if [[ -z "$security_group_id" ]]; then
    errecho "ERROR: You must provide a security group ID with the -i parameter."
    usage
    return 1
  fi

  response=$(aws ec2 delete-security-group --group-id "$security_group_id" --output text) || {
    aws_cli_error_log ${?}
    errecho "ERROR: AWS reports delete-security-group operation failed.$response"
    return 1
  }

  return 0
}

The utility functions used in this example.

###############################################################################
# function errecho
#
# This function outputs everything sent to it to STDERR (standard error output).
###############################################################################
function errecho() {
  printf "%s\n" "$*" 1>&2
}

##############################################################################
# function aws_cli_error_log()
#
# This function is used to log the error messages from the AWS CLI.
#
# The function expects the following argument:
#         $1 - The error code returned by the AWS CLI.
#
#  Returns:
#          0: - Success.
#
##############################################################################
function aws_cli_error_log() {
  local err_code=$1
  errecho "Error code : $err_code"
  if [ "$err_code" == 1 ]; then
    errecho "  One or more S3 transfers failed."
  elif [ "$err_code" == 2 ]; then
    errecho "  Command line failed to parse."
  elif [ "$err_code" == 130 ]; then
    errecho "  Process received SIGINT."
  elif [ "$err_code" == 252 ]; then
    errecho "  Command syntax invalid."
  elif [ "$err_code" == 253 ]; then
    errecho "  The system environment or configuration was invalid."
  elif [ "$err_code" == 254 ]; then
    errecho "  The service returned an error."
  elif [ "$err_code" == 255 ]; then
    errecho "  255 is a catch-all error."
  fi

  return 0
}

//! Delete a security group.
/*!
  \param securityGroupID: A security group ID.
  \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
 */
bool AwsDoc::EC2::deleteSecurityGroup(const Aws::String &securityGroupID,
                                      const Aws::Client::ClientConfiguration &clientConfiguration) {
    Aws::EC2::EC2Client ec2Client(clientConfiguration);
    Aws::EC2::Model::DeleteSecurityGroupRequest request;

    request.SetGroupId(securityGroupID);
    Aws::EC2::Model::DeleteSecurityGroupOutcome outcome = ec2Client.DeleteSecurityGroup(request);

    if (!outcome.IsSuccess()) {
        std::cerr << "Failed to delete security group " << securityGroupID <<
                  ":" << outcome.GetError().GetMessage() << std::endl;
    } else {
        std::cout << "Successfully deleted security group " << securityGroupID <<
                  std::endl;
    }

    return outcome.IsSuccess();
}

[EC2-Classic] To delete a security group

This example deletes the security group named MySecurityGroup. If the command succeeds, no output is returned.

Command:

aws ec2 delete-security-group --group-name MySecurityGroup

[EC2-VPC] To delete a security group

This example deletes the security group with the ID sg-903004f8. Note that you can't reference a security group for EC2-VPC by name. If the command succeeds, no output is returned.

Command:

aws ec2 delete-security-group --group-id sg-903004f8

For more information, see Using Security Groups in the AWS Command Line Interface User Guide.

    /**
     * Deletes an EC2 security group asynchronously.
     *
     * @param groupId the ID of the security group to delete
     * @return a CompletableFuture that completes when the security group is deleted
     */
    public CompletableFuture<Void> deleteEC2SecGroupAsync(String groupId) {
        DeleteSecurityGroupRequest request = DeleteSecurityGroupRequest.builder()
            .groupId(groupId)
            .build();

        CompletableFuture<DeleteSecurityGroupResponse> response = getAsyncClient().deleteSecurityGroup(request);
        return response.whenComplete((resp, ex) -> {
            if (ex != null) {
                throw new RuntimeException("Failed to delete security group with Id " + groupId, ex);
            } else if (resp == null) {
                throw new RuntimeException("No response received for deleting security group with Id " + groupId);
            }
        }).thenApply(resp -> null);
    }

import { DeleteSecurityGroupCommand, EC2Client } from "@aws-sdk/client-ec2";

/**
 * Deletes a security group.
 * @param {{ groupId: string }} options
 */
export const main = async ({ groupId }) => {
  const client = new EC2Client({});
  const command = new DeleteSecurityGroupCommand({
    GroupId: groupId,
  });

  try {
    await client.send(command);
    console.log("Security group deleted successfully.");
  } catch (caught) {
    if (caught instanceof Error && caught.name === "InvalidGroupId.Malformed") {
      console.warn(`${caught.message}. Please provide a valid GroupId.`);
    } else {
      throw caught;
    }
  }
};

suspend fun deleteEC2SecGroup(groupIdVal: String) {
    val request =
        DeleteSecurityGroupRequest {
            groupId = groupIdVal
        }

    Ec2Client { region = "us-west-2" }.use { ec2 ->
        ec2.deleteSecurityGroup(request)
        println("Successfully deleted Security Group with id $groupIdVal")
    }
}

Example 1: This example deletes the specified security group for EC2-VPC. You are prompted for confirmation before the operation proceeds, unless you also specify the Force parameter.

Remove-EC2SecurityGroup -GroupId sg-12345678

Output:

Confirm
Are you sure you want to perform this action?
Performing operation "Remove-EC2SecurityGroup (DeleteSecurityGroup)" on Target "sg-12345678".
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [S] Suspend  [?] Help (default is "Y"):

Example 2: This example deletes the specified security group for EC2-Classic.

Remove-EC2SecurityGroup -GroupName my-security-group -Force

class SecurityGroupWrapper:
    """Encapsulates Amazon Elastic Compute Cloud (Amazon EC2) security group actions."""

    def __init__(self, ec2_client: boto3.client, security_group: Optional[str] = None):
        """
        Initializes the SecurityGroupWrapper with an EC2 client and an optional security group ID.

        :param ec2_client: A Boto3 Amazon EC2 client. This client provides low-level
                           access to AWS EC2 services.
        :param security_group: The ID of a security group to manage. This is a high-level identifier
                               that represents the security group.
        """
        self.ec2_client = ec2_client
        self.security_group = security_group

    @classmethod
    def from_client(cls) -> "SecurityGroupWrapper":
        """
        Creates a SecurityGroupWrapper instance with a default EC2 client.

        :return: An instance of SecurityGroupWrapper initialized with the default EC2 client.
        """
        ec2_client = boto3.client("ec2")
        return cls(ec2_client)


    def delete(self, security_group_id: str) -> bool:
        """
        Deletes the specified security group.

        :param security_group_id: The ID of the security group to delete. Required.

        :returns: True if the deletion is successful.
        :raises ClientError: If the security group cannot be deleted due to an AWS service error.
        """
        try:
            self.ec2_client.delete_security_group(GroupId=security_group_id)
            logger.info(f"Successfully deleted security group '{security_group_id}'")
            return True
        except ClientError as err:
            logger.error(f"Deletion failed for security group '{security_group_id}'")
            error_code = err.response["Error"]["Code"]

            if error_code == "InvalidGroup.NotFound":
                logger.error(
                    f"Security group '{security_group_id}' cannot be deleted because it does not exist."
                )
            elif error_code == "DependencyViolation":
                logger.error(
                    f"Security group '{security_group_id}' cannot be deleted because it is still in use."
                    " Verify that it is:"
                    "\n\t- Detached from resources"
                    "\n\t- Removed from references in other groups"
                    "\n\t- Removed from VPC's as a default group"
                )
            raise

    pub async fn delete_security_group(&self, group_id: &str) -> Result<(), EC2Error> {
        tracing::info!("Deleting security group {group_id}");
        self.client
            .delete_security_group()
            .group_id(group_id)
            .send()
            .await?;
        Ok(())
    }

    TRY.
        lo_ec2->deletesecuritygroup( iv_groupid = iv_security_group_id ).
        MESSAGE 'Security group deleted.' TYPE 'I'.
      CATCH /aws1/cx_rt_service_generic INTO DATA(lo_exception).
        DATA(lv_error) = |"{ lo_exception->av_err_code }" - { lo_exception->av_err_msg }|.
        MESSAGE lv_error TYPE 'E'.
    ENDTRY.